arm/arm64 ipipe performance

Jan Kiszka jan.kiszka at
Tue May 18 20:49:28 CEST 2021

On 18.05.21 20:28, Greg Gallagher via Xenomai wrote:
> Hi Everyone,
>    There's been a noticeable slow down in the arm and arm64 latency of
> late.  I tracked the issue
>  down to the tracing infrastructure.  For now if you hit this issue,
> disable ftrace.  Once this is done the latency numbers look much better.
> I'm currently working on resolving the issue.

Do you mean disabling during build? Or is the issue only present when
tracing is actively used during runtime?

>   New patches will be released this week for both arm and arm64 now that
> the issue is understood and a work around exists.

That's great!


Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux

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