[Bug 71029] [ilk] igt/gem_close_race is slow due to mutex contention vs clflush

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71029

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |minor
           Priority|medium                      |low
            Summary|[ilk] igt/gem_close_race is |[ilk] igt/gem_close_race is
                   |slow                        |slow due to mutex
                   |                            |contention vs clflush

--- Comment #18 from Chris Wilson <chris at chris-wilson.co.uk> ---
Finally booted an Ironlake (i3-330m). Woohoo!

The time here is spent in mutex contention (specifically throwing away cycles
in mutes_spin_on_owner whilst we are clflushing). I think this is just a
pathologically bad condition and not one to worry about (just yet).

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