Lines Matching +full:traffic +full:- +full:patterns
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
37 If set to vendor, prefer vendor-specific driver
69 Documentation/firmware-guide/acpi/debug.rst for more information about
127 Format: <byte> or <bitmap-list>
130 Disable auto-serialization of AML methods
133 auto-serialization feature.
151 Ignore the ACPI-based watchdog interface (WDAT) and let
172 acpi_osi=! # disable all built-in OS vendor
174 acpi_osi=!! # enable all built-in OS vendor
236 For broken nForce2 BIOS resulting in XT-PIC timer.
245 as soon as the kernel's real-mode entry point is called.
283 See Documentation/sound/alsa-configuration.rst
290 align_va_addr= [X86-64]
295 CPU-intensive style benchmark, and it can vary highly in
298 32: only for 32-bit processes
299 64: only for 64-bit processes
300 on: enable for both 32- and 64-bit processes
301 off: disable for both 32- and 64-bit processes
311 Allow execve() of 32-bit applications and setting of the
313 subset of the CPUs support 32-bit EL0. When this
314 parameter is present, the set of CPUs supporting 32-bit
316 and hot-unplug operations may be restricted.
318 See Documentation/arch/arm64/asymmetric-32bit.rst for more
321 amd_iommu= [HW,X86-64]
324 fullflush - Deprecated, equivalent to iommu.strict=1
325 off - do not initialize any AMD IOMMU found in
327 force_isolation - Force device isolation for all
332 force_enable - Force enable the IOMMU on platforms known
335 pgtbl_v1 - Use v1 page table for DMA-API (Default).
336 pgtbl_v2 - Use v2 page table for DMA-API.
337 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
339 amd_iommu_dump= [HW,X86-64]
345 amd_iommu_intr= [HW,X86-64]
348 legacy - Use legacy interrupt remapping mode.
349 vapic - Use virtual APIC mode, which allows IOMMU
351 This mode requires kvm-amd.avic=1.
388 Power management functions (SPARCstation-4/5 + deriv.)
390 Disable APC CPU standby support. SPARCstation-Fox does
391 not play well with APC CPU idle - disable it if you have
398 when initialising the APIC and IO-APIC components.
399 For X86-32, this can also be used to specify an APIC
422 0 -- disable.
423 1 -- enable.
426 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
468 audit= [KNL] Enable the audit sub-system
470 0 | off - kernel audit is disabled and can not be
472 unset - kernel audit is initialized but disabled and
474 1 | on - kernel audit is initialized and partially
487 0 - Disable the BAU.
488 1 - Enable the BAU.
489 unset - Disable the BAU.
516 See Documentation/block/cmdline-partition.rst
529 See Documentation/admin-guide/bootconfig.rst
534 bttv.pll= See Documentation/admin-guide/media/bttv.rst
543 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
562 inclusive. See arch/mips/include/asm/pgtable-bits.h
572 - foo isn't auto-mounted if you mount all cgroups in
574 - foo isn't visible as an individually mountable
576 - if foo is an optional feature then the feature is
582 Specifying "pressure" disables per-cgroup pressure
600 nosocket -- Disable socket memory accounting.
601 nokmem -- Disable kernel memory accounting.
602 nobpf -- Disable BPF memory accounting.
607 0 -- check protection applied by kernel (includes
609 1 -- check protection requested by application.
621 numbers X. Note the Linux-specific bits are not necessarily
622 stable over kernel options, but the vendor-specific
642 force such clocks to be always-on nor does it reserve
646 information, see Documentation/driver-api/clk.rst.
648 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
665 [X86-32] pit,hpet,tsc;
672 [X86-64] hpet,tsc
678 architected timer so that code using WFE-based polling
698 clocksource-wdtest.holdoff= [KNL]
704 cma=nn[MG]@[start[MG][-end[MG]]]
715 Sets the size of kernel per-numa memory area for
717 per-numa CMA altogether. And If this option is not
719 With per-numa CMA enabled, DMA users on node nid will
746 com20020= [HW,NET] ARCnet - COM20020 chipset
750 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
754 ARCnet - COM90xx chipset (memory-mapped buffers)
783 See Documentation/admin-guide/serial-console.rst for more
793 Start an early, polled-mode console on the 8250/16550
796 MMIO inter-register address stride is either 8-bit
797 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
801 the h/w is not re-initialized.
828 syscall, or to executing "dmesg -S --raw" or to reading
852 disable the cpuidle sub-system
858 disable the cpufreq sub-system
866 [X86] Delay for N microsec between assert and de-assert
878 Run kdump after running panic-notifiers and dumping
891 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
894 See Documentation/admin-guide/kdump/kdump.rst for further details.
899 start-[end] where start and end are both
901 Documentation/admin-guide/kdump/kdump.rst for an example.
904 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
912 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
918 for 32-bit devices won't run out. Kernel would try to allocate
921 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
922 --> arm64: 128MiB
923 --> riscv: 128MiB
924 --> loongarch: 128MiB
932 [KNL] Disable crypto self-tests
940 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
955 See also Documentation/input/devices/joystick-parport.rst
968 [KNL] verbose locking self-tests
971 self-tests.
973 (no extra messages), setting it to -1 (all bits set)
974 will print _a_lot_ more information - normally only
1009 Format: { on, no-mount, off }
1011 no-mount:
1016 get a -EPERM as result when trying to register files
1020 Default value is set in build-time with a kernel configuration.
1032 Documentation/admin-guide/mm/hugetlbpage.rst.
1046 delayacct [KNL] Enable per-task delay accounting
1141 entries for DMA-API debugging code. One entry is
1142 required per DMA-API allocation. Use this if the
1143 DMA-API debugging code disables itself because the
1147 With this option the DMA-API debugging driver
1165 Generic built-in EDID data sets are used, if one of
1170 available in Documentation/admin-guide/edid.rst. An EDID
1182 Control how the dt_cpu_ftrs device-tree binding is
1192 what data is available or for reverse-engineering.
1197 Documentation/admin-guide/dynamic-debug-howto.rst
1208 determined by stdout-path property in device tree's
1213 Start an early, polled-mode console on a Cadence
1224 Start an early, polled-mode console on the 8250/16550
1226 MMIO inter-register address stride is either 8-bit
1227 (mmio) or 32-bit (mmio32 or mmio32be).
1237 Start an early, polled-mode console on a pl011 serial
1241 the driver will use only 32-bit accessors to read/write
1250 Start an early, polled-mode console on a meson serial
1256 Start an early, polled-mode console on an msm serial
1262 Start an early, polled-mode console on an msm serial
1268 Start an early, polled-mode console on a serial port
1274 Start an early, polled-mode console on a serial port
1280 Use RISC-V SBI (Supervisor Binary Interface) for early
1298 Start an early, polled-mode console on a lantiq serial
1312 Start an early, polled-mode, output-only console on the
1317 Start an early, polled-mode console on the
1323 Start an early, polled-mode console on a Qualcomm
1331 coherent non-x86 systems that use system memory for
1434 attribute is added to range 0x100000000-0x180000000 and
1435 0x10a0000000-0x1120000000.
1439 range 0x240000000-0x43fffffff.
1451 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1468 elanfreq= [X86-32]
1476 See Documentation/admin-guide/kdump/kdump.rst for details.
1492 0 -- permissive (log only, no denials).
1493 1 -- enforcing (deny and log).
1525 See also Documentation/fault-injection/.
1529 See Documentation/admin-guide/sysctl/net.rst for
1533 See Documentation/admin-guide/blockdev/floppy.rst.
1535 forcepae [X86-32]
1571 ftrace_filter=[function-list]
1573 tracer at boot up. function-list is a comma-separated
1578 ftrace_notrace=[function-list]
1580 function-list. This list can be changed at run time
1584 ftrace_graph_filter=[function-list]
1587 function-list is a comma-separated list of functions
1591 ftrace_graph_notrace=[function-list]
1593 function-list. This list is a comma-separated list of
1613 off -- Don't create device links from firmware info.
1614 permissive -- Create device links from firmware info
1617 on -- Create device links from firmware info and use it
1619 rpm -- Like "on", but also use to order runtime PM.
1632 strict -- Default. Continue waiting on consumers to
1634 timeout -- Give up waiting on consumers and call
1644 See also Documentation/input/devices/joystick-parport.rst
1648 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1672 gcov_persist= [GCOV] When non-zero (default), profiling data for
1682 gpio-mockup.gpio_mockup_ranges
1685 gpio-mockup.gpio_mockup_named_lines
1717 against bounds-checking flaws in the kernel's
1723 [KNL] Should the hard-lockup detector generate
1729 for 64-bit NUMA, off otherwise.
1732 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1739 corresponding firmware-first mode error processing
1749 during restoration read-only).
1775 hpet= [X86-32,HPET] option to control HPET usage
1792 number of pages to allocate per-node can be specified.
1793 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1804 Documentation/admin-guide/mm/hugetlbpage.rst.
1815 boot-time allocation of gigantic hugepages is skipped.
1843 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1849 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1866 (disabled by default, and as a pre-condition
1868 i8042.direct [HW] Put keyboard port into non-translated mode
1882 suspend-to-ram transitions, only during s2r
1906 -1 -- never invert brightness
1907 0 -- machine default
1908 1 -- force brightness inversion
1910 ia32_emulation= [X86-64]
1912 When true, allows loading 32-bit programs and executing 32-bit
1928 idle=nomwait: Disable mwait for CPU C-states
1938 Allow override of default traffic class configuration
1956 legacy only accept legacy-NaN binaries, if supported
1958 2008 only accept 2008-NaN binaries, if supported
1967 'relaxed' straps the emulator for both legacy-NaN and
1968 2008-NaN, whereas 'strict' enables legacy-NaN only on
1977 Ignore loglevel setting - this will print /all/
2044 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2045 "ima-sigv2" }
2046 Default: "ima-ng"
2078 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2079 initcall functions. Useful for debugging built-in
2124 0 -- basic integrity auditing messages. (Default)
2125 1 -- additional integrity auditing messages.
2153 could harm performance of some high-throughput
2162 1 to 9 specify maximum depth of C-state.
2171 algorithms for p-state selection. There are two
2172 P-state selection algorithms provided by
2175 on whether or not the hardware managed P-states
2182 used along with the hardware-managed P-states (HWP)
2186 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2187 instead of acpi-cpufreq may disable platform features, such
2189 P-States information being indicated to OSPM and therefore
2192 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2205 Allow per-logical-CPU P-State performance control limits using
2208 intremap= [X86-64, Intel-IOMMU]
2213 BIOS x2APIC opt-out request will be ignored
2237 0 - Try to allocate a 32-bit DMA address first, before
2239 1 - Allocate directly from the full usable range,
2241 greater than 32-bit addressing.
2245 0 - Lazy mode.
2251 1 - Strict mode.
2254 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2256 legacy driver-specific options takes precedence.
2261 0 - Use IOMMU translation for DMA.
2262 1 - Bypass the IOMMU for DMA.
2263 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2265 io7= [HW] IO7 for Marvel-based Alpha systems
2280 See Documentation/admin-guide/nfs/nfsroot.rst.
2304 Enables support for pseudo-NMIs in the kernel. This
2323 [Deprecated - use cpusets instead]
2324 Format: [flag-list,]<cpu-list>
2355 "number of CPUs in system - 1".
2381 The format of <cpu-list> is described above.
2385 ivrs_ioapic [HW,X86-64]
2386 Provide an override to the IOAPIC-ID<->DEVICE-ID
2390 For example, to map IOAPIC-ID decimal 10 to
2396 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2399 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2403 ivrs_hpet [HW,X86-64]
2404 Provide an override to the HPET-ID<->DEVICE-ID
2408 For example, to map HPET-ID decimal 10 to
2414 * To map HPET-ID decimal 0 to PCI device 00:14.0
2417 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2421 ivrs_acpihid [HW,X86-64]
2422 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2426 For example, to map UART-HID:UID AMD0020:0 to
2432 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2435 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2456 kernelcore= [KNL,X86,IA-64,PPC]
2459 the kernel for non-movable allocations. The requested
2469 subsystem. Note that allocations like PTEs-from-HighMem
2477 for non-movable allocations and remaining memory is used
2488 gdb or control-c on the dbgp connection. When
2489 not using this parameter you use sysrq-g to break into
2494 or a supported polling keyboard driver (non-usb).
2521 Configure the RouterBoard 532 series on-chip
2524 kmemleak= [KNL] Boot-time kmemleak enable/disable
2530 kprobe_event=[probe-list]
2532 The probe-list is a semicolon delimited list of probe
2562 execution by eliminating the write-protection faults
2607 back to huge pages. If the value is a non-zero N, KVM will
2612 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2615 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2616 a.k.a. Two-Dimensional Page Tables. Default is 1
2620 kvm-arm.mode=
2625 nvhe: Standard nVHE-based mode, without support for
2628 protected: nVHE-based mode with support for guests whose
2631 nested: VHE-based mode with support for nested
2640 kvm-arm.vgic_v3_group0_trap=
2641 [KVM,ARM] Trap guest accesses to GICv3 group-0
2644 kvm-arm.vgic_v3_group1_trap=
2645 [KVM,ARM] Trap guest accesses to GICv3 group-1
2648 kvm-arm.vgic_v3_common_trap=
2652 kvm-arm.vgic_v4_enable=
2664 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2665 a.k.a. Two-Dimensional Page Tables. Default is 1
2669 kvm-intel.emulate_invalid_guest_state=
2671 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2677 kvm-intel.flexpriority=
2682 kvm-intel.nested=
2686 kvm-intel.unrestricted_guest=
2692 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2693 CVE-2018-3620.
2704 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2724 on - enable the interface for the mitigation
2789 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2795 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2799 value for LAPIC timer one-shot implementation. Default
2822 libata.force= [LIBATA] Force configurations. The format is a comma-
2834 first fan-out link behind PMP device. It does not
2848 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2855 * rstonce: only attempt one reset during hot-unplug
2950 Specify the number of self-propagating call_rcu()
2958 occasional long-duration lock hold time. Defaults
2969 Set the number of locking read-acquisition kthreads.
2974 Set the number of locking write-acquisition kthreads.
2977 Set time (s) after boot for CPU-hotplug testing.
2980 Set time (s) between CPU-hotplug operations, or
2981 zero to disable CPU-hotplug testing.
2984 Do periodic testing of real-time lock priority
2989 non-real-time spinlocks, due to their disabling
2990 of preemption. Note that non-realtime mutexes
3003 Set task-shuffle interval (jiffies). Shuffling
3004 tasks allows some CPUs to go into dyntick-idle
3009 is useful for hands-off automated testing.
3028 Run the write-side locktorture kthreads at
3029 sched_set_fifo() real-time priority.
3046 7 (KERN_DEBUG) debug-level messages
3056 logo.nologo [FB] Disables display of the built-in Linux logo.
3074 an IEEE 1284-compliant printer is attached; if
3080 time-consuming boot-time autodetection (up to 250 ms per
3101 machvec= [IA-64] Force the use of a particular machine-vector
3107 Example: machtype=lemote-yeeloong-2f-7inch
3109 max_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory greater
3122 (loop.max_loop) unconditionally pre-created at init time. The default
3125 devices can be requested on-demand with the
3126 /dev/loop-control interface.
3128 mce [X86-32] Machine Check Exception
3130 mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
3133 See Documentation/admin-guide/md.rst.
3140 Control mitigation for the Micro-architectural Data
3155 full - Enable MDS mitigation on vulnerable CPUs
3156 full,nosmt - Enable MDS mitigation and disable
3158 off - Unconditionally disable MDS mitigation
3160 On TAA-affected machines, mds=off can be prevented by
3169 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3183 [ARC,MICROBLAZE] - the limit applies only to low memory,
3186 [ARM64] - only limits memory covered by the linear
3199 [ARM,MIPS] - override the memory layout reported by
3206 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3213 per-device physically contiguous DMA buffers.
3221 See Documentation/admin-guide/mm/memory-hotplug.rst.
3246 Example: Exclude memory from 0x18690000-0x1869ffff
3260 memmap=<size>%<offset>-<oldtype>+<newtype>
3262 from <oldtype> to <newtype>. If "-<oldtype>" is left
3277 repeatable BIOS-originated corruption always
3316 pattern from a given set of patterns. Memtest
3321 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3329 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3333 s2idle - Suspend-To-Idle
3334 shallow - Power-On Suspend or equivalent (if supported)
3335 deep - Suspend-To-RAM or equivalent (if supported)
3336 See Documentation/admin-guide/pm/sleep-states.rst.
3338 mfgpt_irq= [IA-32] Specify the IRQ to use for the
3339 Multi-Function General Purpose Timers on AMD Geode
3342 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3354 min_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory below this
3361 0 - The attached screen is the 3.5" TFT
3362 1 - The attached screen is the 7" TFT
3363 2 - The VGA Shield is attached (1024x768)
3367 b - Enable backlight. The TFT backlight pin will be
3371 c - Enable the s3c camera interface.
3372 t - Reserved for enabling touchscreen support. The
3376 https://repo.or.cz/w/linux-2.6/mini2440.git
3381 arch-independent options, each of which is an
3382 aggregation of existing arch-specific options.
3405 ssbd=force-off [ARM64]
3418 have other ways of avoiding SMT-based attacks.
3453 full - Enable mitigation on vulnerable CPUs
3455 full,nosmt - Enable mitigation and disable SMT on
3458 off - Unconditionally disable mitigation
3471 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3501 module_blacklist= [KNL] Do not load a comma-separated list of
3515 movablecore= [KNL,X86,IA-64,PPC]
3526 movable_node [KNL] Boot-time switch to make hotplugable memory
3533 Format: <name>,<region-number>,<size>,<offset>
3536 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3544 See arch/arm/mach-s3c/mach-jive.c
3580 something different and driver-specific.
3620 [NFS] enable 64-bit inode numbers.
3621 If zero, the NFS client will fake up a 32-bit inode
3623 of returning the full 64-bit number.
3624 The default is to return 64-bit inode numbers.
3659 [NFS4] Specify an additional fixed unique ident-
3690 driver. A non-zero value sets the minimum interval
3695 server-to-server copies for which this server is
3707 server-to-server copy, knfsd temporarily mounts
3714 See Documentation/admin-guide/nfs/nfsroot.rst.
3716 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3717 See Documentation/admin-guide/nfs/nfsroot.rst.
3720 See Documentation/admin-guide/nfs/nfsroot.rst.
3724 NMI stack-backtrace request.
3733 0 - turn hardlockup detector in nmi_watchdog off
3734 1 - turn hardlockup detector in nmi_watchdog on
3746 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3750 no4lvl [RISCV] Disable 4-level and 5-level paging modes. Forces
3751 kernel to use 3-level paging instead.
3753 no5lvl [X86-64,RISCV] Disable 5-level paging mode. Forces
3754 kernel to use 4-level paging instead.
3757 caches in the slab allocator. Saves per-node memory,
3794 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3796 noexec [IA-64]
3798 noexec32 [X86-64]
3799 This affects only 32-bit executables.
3800 noexec32=on: enable non-executable mappings (default)
3802 noexec32=off: disable non-executable mappings
3813 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3815 legacy floating-point registers on task switch.
3817 nohalt [IA-64] Tells the kernel not to use the power saving
3819 power-consumption. On the positive side, it reduces
3820 interrupt wake-up latency, which may improve performance
3822 real-time systems.
3832 compared. However, if this command-line option is
3873 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3875 [Deprecated - use intremap=off]
3877 nointroute [IA-64]
3883 noirqdebug [X86-32] Disables the code which attempts to detect and
3888 nojitter [IA-64] Disables jitter checking for ITC timers.
3895 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3898 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3900 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3902 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3904 nomca [IA-64] Disable machine check abort handling
3906 nomce [X86-32] Disable Machine Check Exception
3908 nomfgpt [X86-32] Disable Multi-Function General Purpose
3914 not load if they could possibly displace the pre-
3917 perform display-mode changes or accelerated rendering.
3930 nopcid [X86-64] Disable the PCID cpu feature.
3935 nopti [X86-64]
3951 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3957 nosbagart [IA-64]
3959 no-scroll [VGA] Disables scrollback.
3960 This is required for the Braillex ib80-piezo Braille
3963 nosgx [X86-64,SGX] Disables Intel SGX kernel support.
3983 nosoftlockup [KNL] Disable the soft-lockup detector.
3988 nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch
4001 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV] Disable
4011 [PPC] Don't flush the L1-D cache after accessing user data.
4024 no-vmw-sched-clock
4029 soft-lockup and NMI watchdog (hard-lockup).
4033 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
4041 enabling legacy floating-point and sse state.
4067 nptcg= [IA-64] Override max number of concurrent global TLB
4076 n. So during boot up some boot time memory for per-cpu
4077 variables need be pre-allocated for later physical cpu
4092 See Documentation/admin-guide/sysctl/vm.rst for details.
4095 See Documentation/core-api/debugging-via-ohci1394.rst for more
4110 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4114 boundary - index of last SLC block on Flex-OneNAND.
4116 lock - Configure if Flex-OneNAND boundary should be locked.
4130 running on a platform with a direct-mapped memory-side
4136 page_owner= [KNL] Boot-time page_owner enabling option.
4142 page_poison= [KNL] Boot-time parameter changing the state of
4169 See Documentation/admin-guide/tainted-kernels.rst for
4221 Set to non-zero to probe primary and secondary ISA
4227 Set to non-zero if a chip is present that snoops speed
4275 Set to non-zero to probe tertiary and further ISA
4291 Set to non-zero to probe QDI controllers. By default
4296 Set to non-zero to probe Winbond controllers. Use
4343 bios [X86-32] force use of PCI BIOS, don't access
4345 has a non-standard PCI host bridge.
4346 nobios [X86-32] disallow use of PCI BIOS, only direct
4352 data in IO port 0xCFC, both 32-bit).
4354 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4355 the function, IO port 0xCFA, also 8-bit, sets
4357 through ports 0xC000-0xCFFF).
4364 root domains (aka PCI segments, in ACPI-speak).
4372 disable the use of MSI interrupts system-wide.
4377 primary IO-APIC for bridges that cannot disable
4384 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4408 F0000h-100000h range.
4413 assign-busses [X86] Always assign all PCI bus
4434 <linux-pci@vger.kernel.org>.
4438 a bug to <linux-pci@vger.kernel.org>.
4450 bfsort Sort PCI devices into breadth-first order.
4453 nobfsort Don't sort PCI devices into breadth-first order.
4455 tuning and use the BIOS-configured MPS defaults.
4465 configuration allows peer-to-peer DMA between
4468 that hot-added devices will work.
4483 A PCI-PCI bridge can be specified if resource
4489 for 4096-byte alignment.
4491 end-to-end CRC checking). Only effective if
4522 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4538 allow P2P traffic between devices through
4558 dpc-native Use native PCIe service for DPC only. May
4575 Keep all power-domains already enabled by bootloader on,
4592 pirq= [SMP,APIC] Manual mp-table setup
4593 See Documentation/arch/x86/i386/IO-APIC.rst.
4597 See also Documentation/admin-guide/parport.rst.
4616 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4625 { on | off | curr | res | no-curr | no-res }
4665 none - Limited to cond_resched() calls
4666 voluntary - Limited to cond_resched() and might_sleep() calls
4667 full - Any section that isn't explicitly preempt disabled
4670 print-fatal-signals=
4676 coredump - etc.
4679 you might want to try "ulimit -i unlimited".
4691 or lockdep-detected issues (only if lock debug is on).
4700 on - unlimited logging to /dev/kmsg from userspace
4701 off - logging to /dev/kmsg disabled
4702 ratelimit - ratelimit the logging
4709 Limit processor to maximum C-state
4713 Ignore the _CST method to determine C-states,
4720 Param: "schedule" - profile schedule points.
4721 Param: "sleep" - profile D-state sleeping (millisecs).
4723 Param: "kvm" - profile VM exits.
4724 Param: <number> - step/bucket size as a power of 2 for
4753 pti= [X86-64] Control Page Table Isolation of user and
4758 on - unconditionally enable
4759 off - unconditionally disable
4760 auto - kernel detects whether your CPU model is
4766 [KNL] Number of legacy pty's. Overwrites compiled-in
4778 See Documentation/admin-guide/md.rst.
4781 See Documentation/admin-guide/blockdev/ramdisk.rst.
4800 cross-syscall address exposures. This is only
4806 ras=option[,option,...] [KNL] RAS-specific options
4812 rcu_nocbs[=cpu-list]
4817 enable the no-callback CPU mode, which prevents
4822 "p" for RCU-preempt, "s" for RCU-sched, and "g"
4826 and real-time workloads. It can also improve
4830 list of CPUs is set to no-callback mode from boot.
4834 no-callback mode from boot but the mode may be
4845 This improves the real-time response for the
4859 If triggered before the RCU grace-period machinery
4869 RCU grace-period cleanup.
4873 RCU grace-period initialization.
4877 RCU grace-period pre-initialization, that is,
4878 the propagation of recent CPU-hotplug changes up
4882 Set delay from grace-period initialization to
4895 soliciting quiescent-state help from
4907 Set the SCHED_FIFO priority of the RCU per-CPU
4910 and for the RCU grace-period kthreads (rcu_bh,
4912 set, valid values are 1-99 and the default is 1
4913 (the least-favored priority). Otherwise, when
4914 RCU_BOOST is not set, valid values are 0-99 and
4915 the default is zero (non-realtime operation).
4920 On callback-offloaded (rcu_nocbs) CPUs,
4923 use of the ->nocb_bypass list. However, in the
4924 common non-flooded case, RCU queues directly to
4925 the main ->cblist in order to avoid the extra
4926 overhead of the ->nocb_bypass list and its lock.
4928 a single jiffy, RCU pre-queues the callbacks into
4929 the ->nocb_bypass queue. The definition of "too
4938 batch limiting is re-enabled.
4942 RCU's force-quiescent-state scan will aggressively
4950 Set the page-cache refill delay (in milliseconds)
4951 in response to low-memory conditions. The range
4955 Set the shift-right count to use to compute
4956 the callback-invocation batch limit bl from
4963 Please note that this callback-invocation batch
4964 limit applies only to non-offloaded callback
4973 cache-to-cache transfer latencies.
4979 and for NUMA systems with large remote-access
4995 the wakeup overhead on the global grace-period
4997 each group's NOCB grace-period kthread.
5000 Cause the grace-period kthread to get an extra
5002 it should at force-quiescent-state time.
5015 this specifies an rcu_read_unlock()-time delay
5019 of RCU-protected pointers after the relevant
5029 per-CPU rcuc kthreads. Defaults to a non-zero
5039 grace-period primitives such as call_rcu().
5050 grace-period primitives.
5053 Set test-start holdoff period. The purpose of
5071 Test the double-argument variant of kfree_rcu().
5073 rcuscale.kfree_rcu_test_single, both the single-
5074 and double-argument variants are tested.
5077 Test the single-argument variant of kfree_rcu().
5079 rcuscale.kfree_rcu_test_double, both the single-
5080 and double-argument variants are tested.
5094 does not affect the data-collection interval,
5099 Set number of RCU readers. The value -1 selects
5101 "n" less than -1 selects N-n+1, where N is again
5102 the number of CPUs. For example, -2 selects N
5103 (the number of CPUs), -3 selects N+1, and so on.
5104 A value of "n" less than or equal to -N selects
5117 complete. This is useful for hands-off automated
5124 Write-side holdoff between grace periods,
5129 Additional write-side holdoff between grace
5147 for RCU grace-period forward-progress testing
5154 Specify the fraction of a CPU-stall-warning
5155 period to do tight-loop forward-progress testing.
5159 forward-progress tests.
5163 need_resched() during tight-loop forward-progress
5167 Use conditional/asynchronous update-side
5171 Use expedited update-side primitives, if available.
5174 Use normal (non-expedited) asynchronous
5175 update-side primitives, if available.
5178 Use normal (non-expedited) synchronous
5179 update-side primitives, if available. If all
5183 they are all non-zero.
5191 Leak an RCU-protected pointer out of the reader.
5206 Set number of RCU callback-offload togglers.
5211 callback-offload toggling attempts.
5214 Set number of RCU readers. The value -1 selects
5215 N-1, where N is the number of CPUs. A value
5216 "n" less than -1 selects N-n-2, where N is again
5217 the number of CPUs. For example, -2 selects N
5218 (the number of CPUs), -3 selects N+1, and so on.
5221 Enable debug-object double-call_rcu() testing.
5224 Set time (s) after boot for CPU-hotplug testing.
5227 Set time (jiffies) between CPU-hotplug operations,
5228 or zero to disable CPU-hotplug testing.
5231 Set the number of read-then-exit kthreads used
5233 task-exit processing.
5236 The number of times in a given read-then-exit
5237 episode that a set of read-then-exit kthreads
5242 read-then-exit testing episodes.
5245 Set task-shuffle interval (s). Shuffling tasks
5246 allows some CPUs to go into dyntick-idle mode
5251 is useful for hands-off automated testing.
5260 any other stall-related activity. Note that
5266 in scheduling-while-atomic splats.
5279 grace-period kthread to test RCU CPU stall
5305 Test RCU's dyntick-idle handling. See also the
5360 Use expedited grace-period primitives, for
5364 real-time latency, and degrade energy efficiency.
5368 Use only normal grace-period primitives,
5371 real-time latency, CPU utilization, and
5373 increased grace-period latency. This parameter
5380 only normal grace-period primitives. No effect
5386 post-boot attempt at an expedited RCU grace
5387 period to instead use normal non-expedited
5388 grace-period processing.
5396 set to the default value of -1.
5399 Set the minimum number of callback-queuing-time
5400 lock-contention events per jiffy required to
5401 cause the RCU Tasks flavors to switch to per-CPU
5404 the default value of -1.
5409 of -1 allows this to be automatically (and
5417 number avoids disturbing real-time workloads,
5422 cancel laziness on that CPU. Use -1 to disable
5432 only printed prior to the stall-warning message
5488 force - Override the decision by the kernel to hide the
5516 Set test-start holdoff period. The purpose of
5531 but the default has already reduced the per-pass
5536 Set number of readers. The default value of -1
5545 Set the read-side critical-section duration,
5549 Specify the read-protection implementation to test.
5575 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
5583 reservetop= [X86-32]
5600 See Documentation/power/swsusp-and-swap-files.rst
5616 AMD-based UNRET and IBPB mitigations alone do not stop
5618 sibling threads. For that reason, STIBP is used on pro-
5622 off - no mitigation
5623 auto - automatically select a migitation
5624 auto,nosmt - automatically select a mitigation,
5628 ibpb - On AMD, mitigate short speculation
5633 ibpb,nosmt - Like "ibpb" above but will disable SMT
5637 unret - Force enable untrained return thunks,
5638 only effective on AMD f15h-f17h based
5640 unret,nosmt - Like unret, but will disable SMT when STIBP
5675 ro [KNL] Mount root device read-only on boot
5678 on Mark read-only kernel memory as read-only (default).
5679 off Leave read-only kernel memory writable for debugging.
5680 full Mark read-only kernel memory and aliases as read-only
5686 debug-uart get routed to the D+ and D- pins of the usb
5692 block/early-lookup.c for details.
5717 rw [KNL] Mount root device read-write on boot
5770 to 10 seconds for built-in smp_call_function()
5777 that requesting even small non-zero numbers of
5784 The default of -1 specifies a number of kthreads
5789 test before initiating CPU-hotplug operations.
5793 CPU-hotplug operations. Specifying zero (which
5794 is the default) disables CPU-hotplug operations.
5800 Non-zero values are useful for automated tests.
5823 "wait" parameter. A value of -1 selects the
5824 default if all other weights are -1. However,
5826 value of -1 will instead select a weight of zero.
5831 non-zero "wait" parameter. See weight_single.
5844 non-zero "wait" parameter. See weight_single
5856 non-zero "wait" parameter. See weight_single
5863 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
5864 1 -- enable.
5875 0 -- disable.
5876 1 -- enable.
5879 serialnumber [BUGS=X86-32]
5881 sev=option[,option...] [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
5889 to set it to "all" by meaning -- no limit here.
5895 simeth= [IA-64]
5970 using the csdlock_debug- kernel parameter.
5975 system. By default, let CSD-lock acquisition
5977 for this value provides a 5-minute timeout.
5979 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5980 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5981 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5982 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5983 smsc-ircc2.ircc_irq= [HW] IRQ line
5984 smsc-ircc2.ircc_dma= [HW] DMA channel
5985 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5995 Default: -1 (no limit)
5998 [KNL] Should the soft-lockup detector generate panics.
6001 A value of 1 instructs the soft-lockup detector
6002 to panic the machine when a soft-lockup occurs. It is
6005 respective build-time switch to that functionality.
6008 [KNL] Should the soft-lockup detector generate
6013 See Documentation/admin-guide/laptops/sonypi.rst
6020 on - unconditionally enable, implies
6022 off - unconditionally disable, implies
6024 auto - kernel detects whether your CPU model is
6041 retpoline - replace indirect branches
6042 retpoline,generic - Retpolines
6043 retpoline,lfence - LFENCE; indirect branch
6044 retpoline,amd - alias for retpoline,lfence
6045 eibrs - Enhanced/Auto IBRS
6046 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6047 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6048 ibrs - use IBRS to protect kernel
6058 on - Unconditionally enable mitigations. Is
6061 off - Unconditionally disable mitigations. Is
6064 prctl - Indirect branch speculation is enabled,
6070 - Like "prctl" above, but only STIBP is
6076 - Same as "prctl" above, but all seccomp
6081 - Like "seccomp" above, but only STIBP is
6086 auto - Kernel selects the mitigation depending on
6097 off - Disable mitigation
6098 microcode - Enable microcode mitigation only
6099 safe-ret - Enable sw-only safe RET mitigation (default)
6100 ibpb - Enable mitigation by issuing IBPB on
6102 ibpb-vmexit - Issue IBPB only on VMEXIT
6103 (cloud-specific mitigation)
6128 on - Unconditionally disable Speculative Store Bypass
6129 off - Unconditionally enable Speculative Store Bypass
6130 auto - Kernel detects whether the CPU model contains an
6136 prctl - Control Speculative Store Bypass per thread
6140 seccomp - Same as "prctl" above, but all seccomp threads
6148 on,auto - On Power8 and Power9 insert a store-forwarding
6152 off - No action.
6171 off - not enabled
6173 warn - the kernel will emit rate-limited warnings
6181 fatal - the kernel will send SIGBUS to applications
6186 ratelimit:N -
6206 Certain CPUs are vulnerable to an MDS-like
6226 This kernel-boot parameter defaults to 128,
6227 but takes effect only when the low-order four
6244 instead of the compile-time CONFIG_NR_CPUS.
6248 grace-period sequence counter wrap for the
6249 srcu_data structure's ->srcu_gp_seq_needed field.
6264 Specifies the number of no-delay instances
6271 Specifies the per-grace-period phase, number of
6272 non-sleeping polls of readers. Beyond this limit,
6278 Specifies number of microseconds of non-sleeping
6279 delay between each non-sleeping poll of readers.
6282 Specifies the number of update-side contention
6287 set for contention-based conversions to occur.
6297 force-on: Unconditionally enable mitigation for
6299 force-off: Unconditionally disable mitigation for
6322 stacktrace_filter=[function-list]
6324 will trace at boot up. function-list is a comma-separated
6332 Set the STI (builtin display/keyboard on the HP-PARISC
6334 as the initial boot-console.
6394 to global on non-NUMA machines)
6417 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
6419 <int> -- Number of I/O TLB slabs
6420 <int> -- Second integer after comma. Number of swiotlb
6423 force -- force using of bounce buffers even if they
6425 noforce -- Never use bounce buffers (for debugging)
6440 Ignore sysrq setting - this boot parameter will
6448 cache size. See Documentation/networking/ip-sysctl.rst
6455 Specify "mem" (for Suspend-to-RAM) or "standby" (for
6460 wakeup-capable RTC alarm.
6466 -1: disable all active trip points in all thermal zones
6470 -1: disable all critical trip points in all thermal zones
6477 -1: disable all passive trip points
6483 <deci-seconds>: poll all this frequency
6505 Prevent the CPU-hotplug component of torturing
6509 Dump the ftrace buffer at torture-test shutdown,
6513 with rotating-rust storage.
6518 disables verbose-printk() sleeping.
6521 Duration of each verbose-printk() sleep in jiffies.
6539 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
6577 local - Use the per CPU time stamp counter
6581 global - Event time stamps are synchronize across
6584 counter - Simple counting of events (1, 2, ..)
6588 uptime - Use jiffies as the time stamp.
6589 perf - Use the same clock that perf uses.
6590 mono - Use ktime_get_mono_fast_ns() for time stamps.
6591 mono_raw - Use ktime_get_raw_fast_ns() for time
6593 boot - Use ktime_get_boot_fast_ns() for time stamps.
6597 trace_event=[event-list]
6599 to facilitate early boot debugging. The event-list is a
6600 comma-separated list of trace events to enable. See
6603 trace_instance=[instance-info]
6623 trace_options=[option-list]
6625 The option-list is a comma delimited list of options
6639 trace_trigger=[trigger-list]
6676 See Documentation/admin-guide/mm/transhuge.rst
6684 - "tpm"
6685 - "tee"
6686 - "caam"
6696 - "kernel"
6697 - the same value as trusted.source: "tpm" or "tee"
6698 - "default"
6707 high-resolution timer mode on older hardware, and in
6743 on - Enable TSX on the system. Although there are
6746 several previous speculation-related CVEs, and
6750 off - Disable TSX on the system. (Note that this
6758 auto - Disable TSX if X86_BUG_TAA is present,
6763 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6769 Similar to Micro-architectural Data Sampling (MDS)
6784 full - Enable TAA mitigation on vulnerable CPUs
6787 full,nosmt - Enable TAA mitigation and disable SMT on
6790 vulnerable to cross-thread TAA attacks.
6791 off - Unconditionally disable TAA mitigation
6793 On MDS-affected machines, tsx_async_abort=off can be
6805 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6811 See also Documentation/input/devices/joystick-parport.rst
6813 udbg-immortal [PPC] When debugging early kernel crashes that
6819 Set number of hash buckets for UDP/UDP-Lite connections
6821 uhci-hcd.ignore_oc=
6823 Some badly-designed motherboards generate lots of
6832 unwind_debug [X86-64]
6840 (default -1 = authorized (same as 1),
6846 for newly-detected USB devices (default 2). This
6852 [USB] Set to log all usbfs traffic (default 0 = off).
6874 [USB] Specifies timeout for the initial 64-byte
6881 [USB] A list of quirk entries to augment the built-in
6884 VendorID:ProductID:Flags. The IDs are 4-digit hex
6886 will change the built-in quirk; setting it if it is
6891 a 255-byte read);
6895 Set-Interface requests);
6914 (bInterval-1).
6952 usb-storage.delay_use=
6956 usb-storage.quirks=
6958 override the built-in unusual_devs list. List
6961 and Product ID values (4-digit hex numbers) and
6963 to a common usb-storage quirk flag as follows:
7005 medium is write-protected).
7014 1 - undefined instruction events
7015 2 - system calls
7016 4 - invalid data aborts
7017 8 - SIGSEGV faults
7018 16 - SIGBUS faults
7034 vdso32= [X86] Control the 32-bit vDSO
7035 vdso32=1: enable 32-bit VDSO
7036 vdso32=0 or vdso32=2: disable 32-bit VDSO
7046 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
7048 vector= [IA-64,SMP]
7080 vga= [BOOT,X86-32] Select a particular video mode
7082 Documentation/admin-guide/svga.rst.
7097 - Disable all of the above options
7118 vsyscall= [X86-64]
7121 code). Most statically-linked binaries and older
7145 see VGA-softcursor.txt. Default: 2 = underline.
7150 This is a 16-member array composed of values
7151 ranging from 0-255.
7156 This is a 16-member array composed of values
7157 ranging from 0-255.
7162 This is a 16-member array composed of values
7163 ranging from 0-255.
7168 Set system-wide default UTF-8 mode for all tty's.
7169 Default is 1, i.e. UTF-8 mode is enabled for all
7174 Format=<-1|0|1>
7175 Set system-wide default for whether a cursor
7176 is shown on new VTs. Default is -1,
7181 vt.italic= [VT] Default color for italic text; 0-15.
7184 vt.underline= [VT] Default color for underlined text; 0-15.
7188 see Documentation/watchdog/watchdog-parameters.rst
7189 or other driver-specific files in the
7203 Format: <cpu-list>
7217 Per-cpu work items which run for longer than this
7220 them from noticeably delaying other per-cpu work
7229 Per-cpu workqueues are generally preferred because
7231 locality; unfortunately, per-cpu workqueues tend to
7234 Enabling this makes the per-cpu workqueues which
7248 Documentation/core-api/workqueue.rst.
7261 forces round-robin CPU selection to flush out
7269 on - Enable writecombine, use WUC for ioremap_wc()
7270 off - Disable writecombine, use SUC for ioremap_wc()
7272 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
7276 xen_512gb_limit [KNL,X86-64,XEN]
7286 ide-disks -- unplug primary master IDE devices
7287 aux-ide-disks -- unplug non-primary-master IDE devices
7288 nics -- unplug network devices
7289 all -- unplug all emulated devices (NICs and IDE disks)
7290 unnecessary -- unplugging emulated devices is
7293 never -- do not unplug even if version check succeeds
7301 Select whether to always use non-faulting (safe) MSR
7326 xen_timer_slop= [X86-64,XEN]
7351 preferred over the 2-level event handling, as it is
7368 xive.store-eoi=off [PPC]
7374 xhci-hcd.quirks [USB,KNL]