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From: Greg Gallagher <greg@embeddedgreg.com>
Date: Tue, 25 May 2021 09:21:50 -0400
Message-ID: <CALLqZ8S2QnXuK+5c_O=mLWGsyvL-t0OxGOh319PCq7=rddCxbQ@mail.gmail.com>
Subject: Re: arm/arm64 ipipe performance
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To: liandao <liandao@gmail.com>
Cc: "Xenomai@xenomai.org" <xenomai@xenomai.org>

On Tue, May 25, 2021 at 6:43 AM liandao <liandao@gmail.com> wrote:

> hi greg gallagher,
>     is this mean:the ipipe-core-5.4.119-arm64-2 released on 5/23 also
> should turn off ftrace when config kernel?
>
> On 5/19/21, Greg Gallagher via Xenomai <xenomai@xenomai.org> 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.
> >
> >   New patches will be released this week for both arm and arm64 now tha=
t
> > the issue is understood and a work around exists.
> >
> > Thanks
> >
> > Greg
> >


Yes the same for arm64. I believe I=E2=80=99ve found the issue but for this=
 release
ftrace should not be included in the build to get optimal performance.

Thanks

Greg

>
>