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

Chris Wilson
2016-07-18T10:29:14Z

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

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Chris Wilson, Intel Open Source Technology Centre