Re: [BUG] drm/panthor: intermittent freezes in Xorg xserver

[Marius Dinu <m95d+git@psihoexpert.ro>]

On Mon, 2026-06-29 10.51.32 ++0200, Erik Faye-Lund wrote:
> Silly me, I forgot to disable HTML email, so this one bounced for
> some, resending. Sorry about the duplicate.
> 
> I wonder if you're experiencing the same issue as this?
> 
> https://gitlab.freedesktop.org/mesa/mesa/-/work_items/15116
> 

I have no ideea. That bug report is way above my understanding. Sorry.

> 
> > On Mon, Jun 29, 2026 at 10:24 AM Boris Brezillon <boris.brezillon@collabora.com> wrote:
> >>
> >> On Fri, 26 Jun 2026 14:50:17 +0300
> >> Marius Dinu <m95d+git@psihoexpert.ro> wrote:
> >>
> >> > Hi.
> >> >
> >> > The system is Radxa Rock 5 ITX, RK3588, 32GB RAM,
> >> > mainline kernel v7.1.0 with panthor driver, mesa 26.0.7 with panfrost driver,
> >> > xorg-server v21.1.22 accelerated by modesetting driver, x11perf v1.7.0.
> >>
> >> Are we sure that's a panthor issue? Also, is this a regression
> >> introduced by the latest kernel version, or has it been like that from
> >> the start?
> >>
> >> Also, would you mind opening an issue on [1]?
> >>
> >> >
> >> > The most clean way to reproduce this bug:
> >> > Form a console or ssh session, start Xorg in background, without a window
> >> > manager, and then run x11perf on that display.
> >> >
> >> > Xorg :0 &
> >> > x11perf -all -display :0
> >> >
> >> > The bug: weird intermittent performance issues in some of the tests.
> >> > Examples:
> >> >
> >> >     1000 reps @  18.0799 msec (    55.3/sec): 10x10 rectangle outline
> >> >     1000 reps @  18.0791 msec (    55.3/sec): 10x10 rectangle outline
> >> >     1000 reps @  18.0790 msec (    55.3/sec): 10x10 rectangle outline
> >> >     1000 reps @  18.0789 msec (    55.3/sec): 10x10 rectangle outline
> >> >     1000 reps @   0.0287 msec ( 34800.0/sec): 10x10 rectangle outline
> >> >     5000 trep @  14.4691 msec (    69.1/sec): 10x10 rectangle outline
> >> >
> >> >  5000000 reps @   0.0029 msec (345000.0/sec): 1-pixel solid circle
> >> >  5000000 reps @   0.0009 msec (1100000.0/sec): 1-pixel solid circle
> >> >  5000000 reps @   0.0012 msec (818000.0/sec): 1-pixel solid circle
> >> >  5000000 reps @   0.0000 msec (20900000.0/sec): 1-pixel solid circle
> >> >  5000000 reps @   0.0000 msec (32300000.0/sec): 1-pixel solid circle
> >> > 25000000 trep @   0.0010 msec (979000.0/sec): 1-pixel solid circle
> >> >
> >> >     1000 reps @  31.6607 msec (    31.6/sec): Fill 10x10 trapezoid
> >> >     1000 reps @  16.9012 msec (    59.2/sec): Fill 10x10 trapezoid
> >> >     1000 reps @   0.0234 msec ( 42700.0/sec): Fill 10x10 trapezoid
> >> >     1000 reps @   0.0272 msec ( 36700.0/sec): Fill 10x10 trapezoid
> >> >     1000 reps @  32.1268 msec (    31.1/sec): Fill 10x10 trapezoid
> >> >     5000 trep @  16.1479 msec (    61.9/sec): Fill 10x10 trapezoid
> >> >
> >> > There are no messages in kernel log or Xorg log.
> >> >
> >> > Visually, most of the tests runs fast as expected, but in some of the tests
> >> > it gets "stuck" randomly. The test suddenly freezes while drawing the pattern.
> >> > Then, after a while (a few seconds up to a couple of minutes), it gets
> >> > unstuck by itself, draws a few more patterns extremely fast for less than a
> >> > second, and then it gets stuck again.
> >>
> >> It smells like a signalling issue. Can you check the CPU activity and
> >> report any outstanding process? Can you maybe connect a gdb to the
> >> x11perf to see where it's blocked, and post the backtrace here (or in
> >> the gitlab issue)?
> >>
> >> Regards,
> >>
> >> Boris
> >>
> >> [1]https://gitlab.freedesktop.org/mesa/mesa

Marius


_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip