[Bug 15293] Flash video laggy inside Firefox only with KMS

[bugzilla-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=15293





--- Comment #27 from Anonymous Emailer <anonymous@kernel-bugs.osdl.org>  2010-02-28 13:59:04 ---
Reply-To: andyqos@ukfsn.org

bugzilla-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=15293
>
>
>
>
>
> --- Comment #25 from Pauli<suokkos@gmail.com>   2010-02-27 06:39:33 ---
> I vote for NOTOURBUG too.
>
> Maybe ddx could be a bit better optimized for XGetSubImage that flash is using
> but in end we can't get it perform well enough anyway without modifying the
> blob.
>
> So what exactly is happening to slow down here:
>
> -Flash is playing the video to vram.
> -Flash calls XGetSubImage multiple times per frame to read back the whole
> video.
> -XGetSubImage tries to copy data from VRAM to system memory but there seems to
> be huge latency for CPU to read the data that was just written by GPU.
>
> Hack patch: http://www.youtube.com/watch?v=JLkGGNbBJeI ;)
>

Out of curiosity, why does it work OK with UMS?

I can't see people being too pleased when their distros switch to KMS 
and they the can't play some youtube vids that they could previously.

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