Re: [REGRESSION 7.2] drm/amdgpu: ~275 SDMA jobs per sparse VA bind since 4cdbba5a (RE Requiem 90->4 fps)

[Mikhail Gavrilov]

On Mon, Jun 22, 2026 at 10:44 AM Natalie Vock <natalie.vock@xxxxxx> wrote:
>
> On 6/21/26 22:55, Mikhail Gavrilov wrote:
> > Hi Christian, Alex,
> >
> > git bisect points to
> >
> >    4cdbba5a16aa ("drm/amdgpu: restructure VM state machine v4")
> >
> > as the first bad commit (its parent tests fine) for a severe
> > interactivity regression.
> >
> > It was merged during the current 7.2 merge window; it is not in any
> > released kernel yet and will first appear in 7.2-rc1.
> >
> > Symptom: Resident Evil Requiem (re9.exe under VKD3D-Proton, RADV, RX
> > 7900 XTX / Navi31, gfx11) drops from ~90 to 3-4 fps the instant the
> > camera moves; still scenes are fine. The previous bisect point
> > d352990bcaab is smooth.
>
> I already fixed this in a patchset[1] that should be on its way - seems
> like it didn't make it into rc1 at least?
>
> Christian, Alex, can you make sure that the first patch from that set,
> "drm/amdgpu: Only set bo->moved when the BO was actually moved", is
> included in a -fixes PR for 7.2?
>
> For the record, I intentionally did not include a Fixes: tag in this
> patchset, because the commit was not merged anywhere but
> amd-staging-drm-next at the point of writing, and the same commits in
> amd-staging-drm-next and upstream have different SHAs. AFAIU, this also
> prevents me from telling regzbot that a proper fix is underway for now.
> Not sure if there's a workaround for this?
>
> Best,
> Natalie
>
> [1]
> https://lore.kernel.org/amd-gfx/20260529153051.973261-1-natalie.vock@xxxxxx/

Thanks, Natalie. I applied that first patch ("drm/amdgpu: Only set
bo->moved when the BO was actually moved") on top of ef0c9f75a195 and
the regression is gone -- camera movement is back to ~90 fps.

Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@xxxxxxxxx>

Re regzbot: since I opened the regression, I can link your fix from
here without a Fixes: tag or a matching SHA -- monitor just takes the
thread URL:

#regzbot monitor:
https://lore.kernel.org/amd-gfx/20260529153051.973261-1-natalie.vock@xxxxxx/

Later, once the fix lands upstream, the entry can be closed with a
regzbot "fixed-by" on that commit's SHA.

-- 
Thanks,
Mikhail.