We messed around a bunch with different migration heuristic options with
the intel driver. Certainly there were some measurable improvements
when using greedy, however it was found to cause graphics corruption on
some systems (indeed, corruption issues are to be expected by design
with greedy).
As I understand it, all these performance issues are part and parcel of
iniquities in DRI1/EXA design, and so in theory DRI2 should solve them.
I'm not sure when we can expect DRI2 for -ati, but it's already
available for -intel so I expect it should be arriving soon, hopefully
in the Karmic time frame.
Hopefully this explains why I don't think we need to pursue greedy for
ati.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Triaged => Won't Fix
--
xserver-video-ati defaults MigrationHeuristic to always. Smart and greedy would
give vissible improvement to performance.
https://bugs.launchpad.net/bugs/330545
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