Trying to isolate PREEMPT_RT (full preemption) runaway latency conditions seen
when using the cyclictest on the 4.1.8 SMP PREEMPT_RT kernel. Seen average
latency of 3uS, but runaway or outlier max latency random spikes seem
indeterminate. Noted 72uS with one run of the cyclictest for example.
On August 20, 2016 3:04:43 PM EDT, Tracy Smith
>Using ftace it is difficult to catch the latency since it can occur at
>any
>point during the cyclictest. It is an uncomfortable level of
>indeterminism
>without knowing the cause.
>
>Is there a way to trace random latency jumps on a single core
On 20.08.2016 20:03, T. Smith wrote:
> The goal is to isolate causes of indeterminism when using the PREEMPT_RT
> kernel configuration with full preemption and to characterize latency and
> jitter using ftrace, any recommendations?
What hardware is it ? If it's x86 it's entirely possible you a
Trying to isolate PREEMPT_RT (full preemption) runaway latency conditions seen
when using the cyclictest on the 4.1.8 SMP PREEMPT_RT kernel. Seen average
latency of 3uS, but runaway or outlier max latency seems indeterminate. Noted
72uS with one run of the cyclictest for example. Is this a kno
4 matches
Mail list logo
