admin-guide/pm/intel-speed-select.rst

8 collection of features that give more granular control over CPU performance.
9 With Intel(R) SST, one server can be configured for power and performance for a
15 …tel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enhancing-performance.pdf
25 how these commands change the power and performance profile of the system under
79 Intel(R) Speed Select Technology - Performance Profile (Intel(R) SST-PP)
83 performance requirements. This helps users during deployment as they do not have
85 Technology - Performance Profile (Intel(R) SST-PP) feature introduces a mechanism
86 that allows multiple optimized performance profiles per system. Each profile
89 performance profile and meet CPU online/offline requirement, the user can expect
93 Number or performance levels
96 There can be multiple performance profiles on a system. To get the number of
111 On this system under test, there are 4 performance profiles in addition to the
112 base performance profile (which is performance level 0).
117 Even if there are multiple performance profiles, it is possible that they
119 performance state. It is possible that there is a BIOS setup to unlock or check
138 Properties of a performance level
141 To get properties of a specific performance level (For example for the level 0, below), execute the…
160 Here -l option is used to specify a performance level.
163 the performance levels. The above command is printing properties of the
164 performance level 0.
166 For this performance profile, the list of CPUs displayed by the
169 understand more, execute "intel-speed-select perf-profile info" for performance
191 frequency is increased to 2.8 GHz compared to 2.6 GHz at performance level 0.
193 Get current performance level
196 To get the current performance level, execute::
212 "perf-profile info" command for performance level 0(cpufreq frequency is in
238 Changing performance level
241 To the change the performance level to 4, execute::
253 offline CPUs which are not present in the enable_cpu_mask for this performance
261 Which shows that the base frequency now increased from 2600 MHz at performance
262 level 0 to 2800 MHz at performance level 4. As a result, any workload, which can
263 use fewer CPUs, can see a boost of 200 MHz compared to performance level 0.
268 Each of the performance profiles also specifies weather there is support of
285 changed from "disabled" to "unsupported" compared to performance level 0.
287 This means that at performance level 4, the "speed-select-base-freq" feature is
288 not supported. However, at performance level 0, this feature is "supported", but
290 "speed-select-turbo-freq" (Intel(R) SST-TF) is supported at both performance
519 constant high guaranteed performance, then this feature can be used to execute
525 Performance Profile (Intel(R) SST-PP) performance level configuration. It is
526 possible that only certain performance levels support Intel(R) SST-BF. It is also
527 possible that only base performance level (level = 0) has support of Intel
528 SST-BF. Consequently, first select the desired performance level to enable this
532 performance level 0, but currently disabled. For example for the level 0::
547 performance, execute some workload and measure performance and get a baseline
548 performance to compare against.
550 Here the user wants more guaranteed performance. For this reason, it is likely
559 Measure baseline performance for comparison
564 performance using Intel(R) SST-BF.
567 number means better performance::
603 To get capabilities of Intel(R) SST-BF for the current performance level 0,
622 performance levels. Nevertheless, these CPUs are fixed, and they are presented
652 Power (Intel(R) SST-CP) features. This option sets the minimum performance of each
653 Intel(R) Speed Select Technology - Performance Profile (Intel(R) SST-PP) class to
654 maximum performance so that the hardware will give maximum performance possible
663 - Configure CLOS parameters. Use CLOS.min to set to minimum performance
676 This way, by enabling Intel(R) SST-BF, the performance of this benchmark is
715 CPUs, but the user wants some configurable option to get high performance on
719 depends on the Intel(R) Speed Select Technology - Performance Profile (Intel
720 SST-PP) performance level configuration. It is possible that only a certain
721 performance level supports Intel(R) SST-TF. It is also possible that only the base
722 performance level (level = 0) has the support of Intel(R) SST-TF. Hence, first
723 select the desired performance level to enable this feature.
726 performance level 0, but currently disabled::
741 To check if performance can be improved using Intel(R) SST-TF feature, get the turbo
748 To get the base turbo capability of performance level 0, execute::
815 Based on turbostat output, the performance is limited by frequency cap of 3100
816 MHz. To check if the hackbench performance can be improved for CPU 12 and CPU
817 13, first check the capability of the Intel(R) SST-TF feature for this performance
909 This improved performance by around 3.3% improvement on a busy system. Here the