[Bug 26225] Firefox slow with accel, fast with noaccel

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Jan 25 13:49:09 PST 2010


--- Comment #2 from Alex Deucher <agd5f at yahoo.com>  2010-01-25 13:49:09 PST ---
radeon doesn't call any pixman stuff directly.  It just provides EXA hooks and
the core EXA code in the xserver does the rest.  I suspect you are hitting a
software fallback for a specific operation and due to the migration of data
from then back to vram you are seeing the slow down.  With accel disabled, the
driver uses shadowfb which keeps the framebuffer in system ram so software
fallbacks do not require migration across the bus.

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