[Bug 28114] Full screen video playback choppy after git commit 78e7047c

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue May 18 08:34:04 PDT 2010


--- Comment #10 from Michel Dänzer <michel at daenzer.net> 2010-05-18 08:34:04 PDT ---
(In reply to comment #9)
> I realy don't know what is real problem because the Attila's patch
> that fixes the problem is practicaly moving the XV buffer to VRAM that
> should be very slow for everyone.

Actually it seems rather unusually slow on your system. Even this PowerBook
(which doesn't even have write combining) manages more than 100 MB/s for CPU
writes to VRAM.

> I can later today upload a test application to see how fast memory access is to
> VRAM. But I still don't understand why GPU reading from GTT is very slow for
> X1300 (laptop card?).

I'm not sure either, but I guess the bicubic filtering could require quite a
lot of bandwidth for texture sampling.

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