Lines Matching refs:noise

8 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
91 Note that the example above shows a high number of HW noise samples.
102  - osnoise/runtime_us: how long an osnoise thread will look for noise.
103  - osnoise/stop_tracing_us: stop the system tracing if a single noise
106  - osnoise/stop_tracing_total_us: stop the system tracing if total noise
110    considered as noise, in us. When set to 0, the default value will
130    workload, allowing only IRQ and hardware-related noise.
132    allowing only NMIs and hardware-related noise, like hwlat tracer.
140  - osnoise:sample_threshold: printed anytime a noise is higher than
142  - osnoise:nmi_noise: noise from NMI, including the duration.
143  - osnoise:irq_noise: noise from an IRQ, including the duration.
144  - osnoise:softirq_noise: noise from a SoftIRQ, including the
146  - osnoise:thread_noise: noise from a thread, including the duration.
154 IRQ execution. This logic is valid for all sources of noise.
163 In this example, a noise sample of 8 microseconds was reported in the last
166 timer IRQ execution. The first event is not part of the noise because