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/linux/Documentation/tools/rtla/
H A Drtla-hwnoise.rst9 Detect and quantify hardware-related noise
25 noise is allowed.
43 The tool is set to detect any noise higher than *one microsecond*,
63 all noise that the tool observed, and the *% CPU Aval* is the relation
66 The *Max Noise* column is the maximum hardware noise the tool detected in a
67 single period, and the *Max Single* is the maximum single noise seen.
69 The *HW* and *NMI* columns show the total number of *hardware* and *NMI* noise
73 *86 us* of noise during the entire execution, leaving *99.99997 %* of CPU time
75 noise to the application, but it was certainly caused by more than one single
76 noise, as the *Max Single* noise was of *3 us*. The CPU has *HW noise,* at a
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H A Drtla-osnoise.rst5 Measure the operating system noise
20 a summary of the noise of the operating system, including the counters of
22 for each noise via the **osnoise:** tracepoints. The **rtla osnoise top**
24 The **rtla osnoise hist** mode displays information about the noise using
/linux/Documentation/trace/
H A Dosnoise-tracer.rst8 NMIs, IRQs, SoftIRQs, and any other system thread can cause noise to the
9 system. Moreover, hardware-related jobs can also cause noise, for example,
13 source of noise: *hardware noise*.
36 events. When a noise happens without any interference from the operating
37 system level, the hardware noise counter increases, pointing to a
38 hardware-related noise. In this way, osnoise can account for any
40 prints the sum of all noise, the max single noise, the percentage of CPU
41 available for the thread, and the counters for the noise sources.
82 - The NOISE IN US reports the sum of noise in microseconds observed
86 - The MAX SINGLE NOISE IN US reports the maximum single noise observed
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/linux/drivers/media/dvb-frontends/
H A Dlgdt330x.c496 u32 noise; /* noise value */ in lgdt3302_read_snr() local
505 noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2]; in lgdt3302_read_snr()
510 noise = ((buf[0] & 7 << 3) << 13) | (buf[3] << 8) | buf[4]; in lgdt3302_read_snr()
517 noise = ((buf[0] & 3) << 8) | buf[1]; in lgdt3302_read_snr()
531 state->snr = calculate_snr(noise, c); in lgdt3302_read_snr()
533 dprintk(state, "noise = 0x%08x, snr = %d.%02d dB\n", noise, in lgdt3302_read_snr()
543 u32 noise; /* noise value */ in lgdt3303_read_snr() local
552 noise = ((buf[0] & 0x78) << 13) | (buf[1] << 8) | buf[2]; in lgdt3303_read_snr()
557 noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4]; in lgdt3303_read_snr()
564 noise = (buf[0] << 8) | buf[1]; in lgdt3303_read_snr()
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H A Dor51132.c461 int noise, reg; in or51132_read_snr() local
467 noise = or51132_readreg(state, 0x02); in or51132_read_snr()
468 if (noise < 0) { in or51132_read_snr()
472 dprintk("read_snr noise (%d)\n", noise); in or51132_read_snr()
501 state->snr = calculate_snr(noise, c) - usK; in or51132_read_snr()
504 dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise, in or51132_read_snr()
H A Dlgdt3305.c986 u32 noise; /* noise value */ in lgdt3305_read_snr() local
994 noise = ((read_reg(state, LGDT3305_PT_MSE_1) & 0x07) << 16) | in lgdt3305_read_snr()
1001 noise = ((read_reg(state, LGDT3305_EQ_MSE_1) & 0x0f) << 16) | in lgdt3305_read_snr()
1009 noise = (read_reg(state, LGDT3305_CR_MSE_1) << 8) | in lgdt3305_read_snr()
1019 state->snr = calculate_snr(noise, c); in lgdt3305_read_snr()
1022 lg_dbg("noise = 0x%08x, snr = %d.%02d dB\n", noise, in lgdt3305_read_snr()
/linux/include/trace/events/
H A Dosnoise.h15 u64 noise; /* noise */ member
46 __field( u64, noise )
57 __entry->noise = s->noise;
70 __entry->noise,
/linux/drivers/net/wireless/ath/
H A Dspectral_common.h56 s8 noise; member
100 __be16 noise; member
124 __be32 noise; member
/linux/Documentation/ABI/testing/
H A Dsysfs-bus-iio-adc-mcp356432 conversions, which is on the order of magnitude of the noise
45 1/f noise into the system that can be modulated with the
49 greatly reduces (cancels out) the 1/f noise and cancels the
51 the system is not affected by this 1/f noise component of the
/linux/drivers/net/wireless/mediatek/mt76/
H A Dmt792x_mac.c240 if (!phy->noise) in mt792x_phy_update_channel()
241 phy->noise = nf << 4; in mt792x_phy_update_channel()
243 phy->noise += nf - (phy->noise >> 4); in mt792x_phy_update_channel()
250 state->noise = -(phy->noise >> 4); in mt792x_phy_update_channel()
/linux/tools/testing/selftests/bpf/progs/
H A Dtailcall_bpf2bpf4.c20 int noise = 0; variable
33 if (noise) in subprog_tail_2()
/linux/drivers/media/pci/cx88/
H A Dcx88-dsp.c159 s32 carrier, stereo, dual, noise; in detect_a2_a2m_eiaj() local
189 noise = noise_magnitude(x, N, FREQ_NOISE_START, FREQ_NOISE_END); in detect_a2_a2m_eiaj()
193 carrier, stereo, dual, noise); in detect_a2_a2m_eiaj()
216 (noise < 10) && in detect_a2_a2m_eiaj()
/linux/Documentation/sound/soc/
H A Dpops-clicks.rst8 powered up and causes a popping noise on the speakers).
50 An unwanted zipper noise can occur within the audio playback or capture stream
51 when a volume control is changed near its maximum gain value. The zipper noise
/linux/Documentation/userspace-api/media/dvb/
H A Dfe-read-snr.rst31 The signal-to-noise ratio is stored into \*snr.
36 This ioctl call returns the signal-to-noise ratio for the signal
/linux/Documentation/userspace-api/media/drivers/
H A Dthp7312.rst35 Enable/Disable auto noise reduction.
38 Set the noise reduction strength, where 0 is the weakest and 10 is the
/linux/kernel/trace/
H A Dtrace_osnoise.c485 entry->noise = sample->noise; in __record_osnoise_sample()
1409 s64 noise = 0, max_noise = 0; in run_osnoise() local
1478 noise = time_sub(sample, last_sample); in run_osnoise()
1483 if (noise < 0) { in run_osnoise()
1503 if (noise >= threshold) { in run_osnoise()
1506 if (noise > max_noise) in run_osnoise()
1507 max_noise = noise; in run_osnoise()
1512 sum_noise += noise; in run_osnoise()
1514 trace_sample_threshold(last_sample, noise, interference); in run_osnoise()
1517 if (noise > stop_in) in run_osnoise()
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/linux/drivers/net/wireless/ath/ath9k/
H A Dcalib.c68 s8 noise = ATH_DEFAULT_NOISE_FLOOR; in ath9k_hw_getchan_noise() local
74 noise += delta; in ath9k_hw_getchan_noise()
76 return noise; in ath9k_hw_getchan_noise()
431 ah->noise = ath9k_hw_getchan_noise(ah, chan, chan->noisefloor); in ath9k_hw_getnf()
/linux/Documentation/sound/designs/
H A Dpowersave.rst34 Note that you might hear click noise/pop when changing the power
42 consumption, but might result in longer wake-up time and click noise.
/linux/drivers/net/wireless/realtek/rtl818x/rtl8187/
H A Drtl8187.h46 u8 noise; member
136 u8 noise; member
/linux/fs/jffs2/
H A Dscan.c27 #define noisy_printk(noise, fmt, ...) \ argument
29 if (*(noise)) { \
31 (*(noise))--; \
32 if (!(*(noise))) \
454 int noise = 0; in jffs2_scan_eraseblock() local
612 noise = 10; in jffs2_scan_eraseblock()
751 noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n", in jffs2_scan_eraseblock()
767 …noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calcul… in jffs2_scan_eraseblock()
/linux/Documentation/devicetree/bindings/input/touchscreen/
H A Dbrcm,iproc-touchscreen.txt55 - touchscreen-fuzz-x: horizontal noise value of the absolute input
57 - touchscreen-fuzz-y: vertical noise value of the absolute input
/linux/Documentation/admin-guide/media/
H A Dipu3.rst246 high quality images. Besides, "STILL" mode need XNR3 to do noise reduction,
504 BNR Bayer noise reduction block removes image noise by
508 that performs noise reduction in the Bayer domain. The
533 CHNR Chroma noise reduction
535 performs noise reduction by cleaning the high
536 frequency noise.
541 noise reduction algorithm used to improve image
542 quality. This removes the low frequency noise in the
548 frames in time to remove anomalies / noise in pixel
/linux/drivers/net/wireless/broadcom/b43legacy/
H A Dmain.c796 u8 noise[4]; in handle_irq_noise() local
806 *((__le32 *)noise) = cpu_to_le32(b43legacy_jssi_read(dev)); in handle_irq_noise()
807 if (noise[0] == 0x7F || noise[1] == 0x7F || in handle_irq_noise()
808 noise[2] == 0x7F || noise[3] == 0x7F) in handle_irq_noise()
814 noise[0] = clamp_val(noise[0], 0, ARRAY_SIZE(phy->nrssi_lt) - 1); in handle_irq_noise()
815 noise[1] = clamp_val(noise[1], 0, ARRAY_SIZE(phy->nrssi_lt) - 1); in handle_irq_noise()
816 noise[2] = clamp_val(noise[2], 0, ARRAY_SIZE(phy->nrssi_lt) - 1); in handle_irq_noise()
817 noise[3] = clamp_val(noise[3], 0, ARRAY_SIZE(phy->nrssi_lt) - 1); in handle_irq_noise()
818 dev->noisecalc.samples[i][0] = phy->nrssi_lt[noise[0]]; in handle_irq_noise()
819 dev->noisecalc.samples[i][1] = phy->nrssi_lt[noise[1]]; in handle_irq_noise()
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/linux/drivers/net/wireguard/
H A DMakefile4 wireguard-y += noise.o
/linux/scripts/
H A Dspdxexclude6 # create lots of noise for no value

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