Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes: > We have conflicting benchmark data that suggest either age 0 or age 3 is > better. However, the earlier benchmark on which we based the switch to > age 0 > > (commit 0d8ff15e9a15f2b393e53337a107b7a1e5919b6d > Author: Ben Widawsky <benjamin.widawsky@xxxxxxxxx> > Date: Thu Jul 4 11:02:03 2013 -0700 > > drm/i915/hsw: Set correct Haswell PTE encodings) > > actually seems to prefer the default PTE encoding as age 3. Presumably, > this is in part due to the use of MOCS to override the PTE encodings > when appropriate. This bothered me when reviewing the kernel code for hsw. Thanks. Reviewed-by: Eric Anholt <eric@xxxxxxxxxx> Note that userspace doesn't currently set MOCS other than the L3 bit. I'm hoping we end up not having to, since we don't have a WT option in MOCS other than "just listen to the PTEs".
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