On 08/12/2013 06:07 AM, ville.syrj...@linux.intel.com wrote:
From: Ville Syrjälä <ville.syrj...@linux.intel.com>
According to HSW Bspec L3$ evictions may land in LLC regardless of
LLC MOCS/PTE settings. That means we shouldn't set scanout buffers
as L3 cacheable when writing to them.
So far I've been unable to observe this phenomenon on my IVB, but
better safe than sorry. Especially since this doesn't appear to
hurt performance.
Ideally this should be limited to scanout buffers, but that information
is not availabe to Mesa. Limiting it to winsys buffers might be a
reasonable comporomise, but MOCS setup appears to be done at a
lower layer where that information is already lost, and I was too
lazy to start passing that infromation down.
Let's try harder to add that plumbing. I'll try to think of something tomorrow.
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