[Mesa-dev] [PATCH] i965: Prefer Meta over the BLT for BlitFramebuffer.

[Ben Widawsky]

On Tue, Feb 17, 2015 at 05:39:33PM -0800, Kenneth Graunke wrote:
> There's some debate about whether we should use Meta or BLORP,
> but either should run circles around the BLT engine.
> 
> In particular, this means that Gen8+ will use the 3D engine for blits,
> like we do on Gen6-7.
> 
> Improves performance in "copypixrate -blit -back" (from Mesa demos)
> by 232.037% +/- 3.15795% (n=10) on Broadwell GT3e.
> 
> v2: Rebase on Laura's changes.
> 
> Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
> Cc: "10.5" <mesa-stable at lists.freedesktop.org>

Personally, I am not sure about the Cc 10.5 only because I couldn't find wins on
BSW, and that makes me worry that we missed something - since I was really
expecting to see something. I'll defer to you on that however.

The idea makes sense to me.
Acked-by: Ben Widawsky <ben at bwidawsk.net>

[snip]