From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Anholt <eric@anholt.net>
Subject: Re: [PATCH] drm/i915: Use MLC (l3$) for context objects
Date: Thu, 19 Jul 2012 07:53:41 -0700
Message-ID: <87mx2vkdje.fsf@eliezer.anholt.net>
References: <1342697003-4067-1-git-send-email-chris@chris-wilson.co.uk>
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Chris Wilson <chris@chris-wilson.co.uk> writes:

> Enabling context support increases SwapBuffers latency by about 20%
> (measured on an i7-3720qm). We can offset that loss slightly by enabling
> faster caching for the contexts. As they are not backed by any
> particular cache (such as the sampler or render caches) our only option
> is to select the generic mid-level cache. This reduces the latency of
> the swap by about 5%.

The UFO driver is doing LLC/MLC on all buffers by using the cacheability
control field.  I think we should do the same by just setting all our
pte fields for LLC+MLC instead of special casing contexts.

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