[Bug 27139] html5 ogg video playback in firefox unusable

[bugzilla-daemon at freedesktop.org]

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

--- Comment #15 from Karl Tomlinson <bugs.freedesktop at karlt.net> 2010-08-12 23:22:54 PDT ---
https://bugzilla.mozilla.org/show_bug.cgi?id=581797 covers changing from
RepeatNone to RepeatPad for Firefox video.

However, I fear there still may be situations where software fallback happens
and fallback seems much much slower than necessary (as indicated by better
perf with ums).

Can mmap access be satisfactory/tolerable for software fallback, if only reads
(no writes) are performed?

i.e. Is the big problem here that pixman is alternating reading and writing
from the mmapped vram (which invalidates readahead/caches, triggers barriers,
or something)?

If so, I wonder whether which of these would be more appropriate:

A) that exa passes a new EXA_PREPARE_RW flag to indicate that read *and*
   write access is required, so that RADEONPrepareAccess_CS can return false
   and the pixmap be migrated to system ram, or

B) that exa or pixman be modified so that read/write ping-ponging does not
   happen?

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