[Bug 103314] Strange slow-fast performance latching between gfxbench3 (and 4) test runs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103314

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Tvrtko Ursulin from comment #3)
> Btw, should I be seeing "Using a blit copy to avoid stalling on..." messages
> since I have INTEL_DEBUG=perf turned on? Or there is some other path wo/
> perf_debug which does blitter uploads as well?

Yes... And you still see high BCS usage on master? That too shouldn't happen
for brw_blorp_copy_buffers, so another indication of barking up the wrong tree.

Let's see if we can perf_debug() the switch from RCS to BCS.

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