[Bug 73064] [ilk Regression] Generalized slowness after upgrade to kernel 3.10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73064

--- Comment #16 from Chris Wilson <chris at chris-wilson.co.uk> ---
I feel fairly confident that the x11perf differences are an artifact of IPS.
(The image tests were for a reference point to check that CPU/memory
performance was the same between kernels. But you can notice that the tests
gradually got quicker in 3.12, which is a sign of IPS - if you keep on running
-copywinwin500 does it plateau at the 3.9 levels?)

I don't think those measurements give me the explanation I was looking for
though - I had hoped that the GPU copy performance would mirror the dramatic
performance difference in workspace switching between 3.9 and 3.12.

There is one other thing to quickly test, add

Section "Device"
 Identifier "Device0"
 Driver "intel"
 Option "AccelMethod" "sna"
EndSection

to your /etc/X11/xorg.conf

That also won't explain what changed in the kernel, but I am curious to know
how it performs on your upset machine.

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