[Bug 77263] [BDW GT3]System hangs while running glxgear with SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77263

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #5)
> (In reply to comment #2)
> > Have you tried the usual suspects? Disable rc6, ppgtt, hw contexts?
> 
> Jinxian, please try disable rc6.
> 
> ppgtt: I thought it's not enabled by default?

Depends on just which branch you test. -nightly should be just the aliasing
ppgtt, might be worth just disabling even the aliasing.

> hw contexts: I don't have idea. Chris can you tell how to disable it?

It requires a kernel patch to disable. And unfortunately mesa no longer works
without contexts, so we can't test the theory that context switching is the
root cause - or we could cook up igt/rendercopy to use multiple contexts
concurrently and see what happens.

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