[Bug 109609] [SKL/CFL GT2] Up to 20% perf drop in Sacha Willems' Vulkan Triangle demo

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Feb 14 16:39:32 UTC 2019


--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
I can reproduce a 20% difference, but it's...actually a 20% improvement.  My
system is a Kabylake GT2 (Dell XPS 15 9650), Kernel 4.20.2-arch1-1-ARCH,
xserver 1.20.3.

It looks like a2ec78883f4 is slow, and 0b44644ca68 (genxml: Consistently use a
numeric "MOCS" field) is 20% faster.  Needless to say, this is not expected,
that patch was supposed to just change the mechanism for programming MOCS, not
the actual values of MOCS used anywhere.

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