[Mesa-dev] [PATCH 16/16] i965: Enable tiled memcpy tex image path on non-LLC

[Chris Wilson]

On Wed, May 24, 2017 at 01:04:58PM -0700, Matt Turner wrote:

I found the performance of the Y-detiling to be atrocious into WC (due
to the access pattern jumping 64 bytes and so neatly sabotaging the
WCB).

I did a very rough sketch for using a temporary page to detile into:
https://cgit.freedesktop.org/~ickle/mesa/commit/?h=brw-batch2&id=83b9069202634299e25d9aaab74bf7a8fe3ecf63
that brought the performance back into line with expectations (i.e.
faster than using GTT on byt and bsw).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre