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From: Greg Gallagher <greg@embeddedgreg.com>
To: liandao <liandao@gmail.com>
Cc: "Xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: arm/arm64 ipipe performance
Date: Tue, 25 May 2021 09:21:50 -0400	[thread overview]
Message-ID: <CALLqZ8S2QnXuK+5c_O=mLWGsyvL-t0OxGOh319PCq7=rddCxbQ@mail.gmail.com> (raw)
In-Reply-To: <CAMC3Yu0FizU008EE9RNB+jMZUxeg8R-u+7v4FGCFjLsLP7aRFg@mail.gmail.com>

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 that
> > the issue is understood and a work around exists.
> >
> > Thanks
> >
> > Greg
> >


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

Thanks

Greg

>
>

      reply	other threads:[~2021-05-25 13:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-18 18:28 arm/arm64 ipipe performance Greg Gallagher
2021-05-18 18:49 ` Jan Kiszka
2021-05-18 19:06   ` Greg Gallagher
2021-05-20 19:14     ` Robert Berger
2021-05-25 10:43 ` liandao
2021-05-25 13:21   ` Greg Gallagher [this message]

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