arm/arm64 ipipe performance

Greg Gallagher greg at embeddedgreg.com
Tue May 18 21:06:52 CEST 2021


On Tue, May 18, 2021 at 2:49 PM Jan Kiszka <jan.kiszka at siemens.com> wrote:

> 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!
>
> Jan
>
> --
> Siemens AG, T RDA IOT
> Corporate Competence Center Embedded Linux


Hi,
   I mean disabled during build time. That’s at least how I tested to see
that the issue went away. Hopefully I’ll have a solution soon.

Thanks

Greg


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