[Intel-gfx] [PATCH] drm/i915: Use SSE4.1 movntdqa to accelerate reads from WC memory

[Chris Wilson]

On Mon, Jul 18, 2016 at 11:07:14AM +0100, Chris Wilson wrote:
> This patch provides the infrastructure for performing a 16-byte aligned
> read from WC memory using non-temporal instructions introduced with sse4.1.
> Using movntdqa we can bypass the CPU caches and read directly from memory
> and ignoring the page attributes set on the CPU PTE i.e. negating the
> impact of an otherwise UC access. Copying using movntqda from WC is almost

                                                  ARGH.
						  -Chris

-- 
Chris Wilson, Intel Open Source Technology Centre