[PATCH xserver 1/2] Revert "glamor: Remove the FBO cache."

Marek Olšák maraeo at gmail.com
Mon Mar 6 21:36:07 UTC 2017

On Fri, Mar 3, 2017 at 9:46 AM, Michel Dänzer <michel at daenzer.net> wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
> This reverts commit 950ffb8d6fd1480f305e38c571bda44f247f1de2 (and parts
> of commit 4b5326aeba539249fcded91bf7806a708eeca651).
> It halved (or worse) the performance with some x11perf tests on
> radeonsi, even though radeonsi has a BO cache.
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
> ---
> I suspect the reason why radeonsi's BO cache can't make up for the lack of
> the glamor FBO cache is that the former can only return idle BOs. So
> while the glamor FBO cache allows re-using the same FBO over and over
> for a series of operations using temporary pixmaps of the same size, the
> radeonsi BO cache has to keep using different BOs until a command stream
> is flushed to the GPU and processed by it.

I don't think the radeonsi cache is sufficient here. It only hides the
kernel overhead. It doesn't hide any overhead of Mesa itself.


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