ORC support for arm64, and compositor performance

[David Ing]

Mart,

I am curious:  What is the highest version of gstreamer that you observed
this crash with?

Also:  It sounds like you verified it was definitely ORC by disabling those
optimizations, and running without a crash.  Is that correct?

On Tue, Feb 8, 2022 at 1:27 AM Mart Raudsepp <leio at gentoo.org> wrote:

> Ühel kenal päeval, T, 01.02.2022 kell 04:04, kirjutas Nirbheek Chauhan
> via gstreamer-devel:
> > On Mon, Jan 31, 2022 at 11:30 PM David Ing via gstreamer-devel
> > <gstreamer-devel at lists.freedesktop.org> wrote:
> > >
> > > Nevermind, now I see the column "c64x-c" is compatible with some
> > > arm processors.
> > >
> >
> > Yes, ARM64 should work on most platforms since these MRs:
> >
> > https://gitlab.freedesktop.org/gstreamer/orc/-/merge_requests/50
> > https://gitlab.freedesktop.org/gstreamer/orc/-/merge_requests/53
>
> In my experience there are crashing issues still around when I last
> tried (and there haven't been any relevant fixes on top as far as I can
> see) for some compositor and/or scaling workloads, so personally had to
> migrate back to using x86_64 for the time being. Running without these
> orc NEON optimizations was too slow.
>
> Unfortunately I wasn't able to narrow the crashes down much (time-
> wise), but assumed it might be related to
> https://gitlab.freedesktop.org/gstreamer/orc/-/issues/20
> and others.
>
> I hope you'll have better luck, or the time to make sure things are
> reported and fixed. You'll need to use orc from git or git snapshot, at
> least until 0.4.33 is released, as 0.4.32 release does not yet include
> this work from the referenced merge requests.
> So also just a warning that it's fresh code that's not even in a
> release yet, and you'll want to test this extensively before putting
> into production or so :)
>
>
> Mart
>
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