[Bug 91926] [SKL bisected] texsubimage pbo intermittent failures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91926

--- Comment #53 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
(In reply to Topi Pohjolainen from comment #52)
> I hacked intel_buffer_objects.c::alloc_buffer_object() to pass extra 4096
> bytes to the size given to drm_intel_bo_alloc(). This seems to prevent the
> failure also (at least I get 200 test rounds without pixel failures).
> 
> I used a hack since this interface (glBufferData()) has no notion of width
> or height and therefore preventing cleaner solution.
> 
> 
> I would like to note that without knowing the algorithm for the cache
> handling, these findings are not yet conclusive - it is still possible that
> they are once again hiding the real explanation.

This also makes a difference on SKL. I tried with the original piglit test -
200 rounds without failure.

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