[Bug 27139] html5 ogg video playback in firefox unusable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27139

--- Comment #14 from Alex Deucher <agd5f at yahoo.com> 2010-08-12 05:55:13 PDT ---
(In reply to comment #13)
> I'm puzzled by / curious about two things:
> 
> 1. I don't think/recall that this issue was noticeable with user mode setting.
>    The same fallback happens without kms, right?
>    Is the migration policy different with kms, or why the apparent regression?
> 

Fallback is the same regardless of kms vs. ums.  With kms the driver manages
pixmaps vs. exa core with ums.

> 2. The fallback composite seems much slower than even fetching a snaphot of
>    the whole screen.
>    Is the vram being accessed via mmap or similar rather than a faster bulk
>    fetch?  (Is this what Pauli was implying?)

EXA migrates the pixmap to system ram for a fallback, then migrates it back to
vram when it's needed for accel.

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