EXA and MigrationHeuristic

[Thomas Fritzsche]

Hi Eric,

wow, I just checked your blog: http://anholt.livejournal.com/37822.html
Looks like you are really close to get this done, "just" this pink color issue.
There is only a very little diff between intel-batchbuffer and your version?
Sounds like you are very close, isn't it?

Thanks,
 Thomas
On Thu, May 29, 2008 at 4:11 AM, Eric Anholt <eric at anholt.net> wrote:
> On Wed, 2008-05-28 at 20:46 +0200, Juliusz Chroboczek wrote:
>> Dear all,
>>
>> After my recent adventures with Radeon, XAA and EXA, I've come to the
>> conclusion that setting MigrationHeuristic to greedy drastically helps
>> performance of Firefox redraws on both Radeon and i965GM hardware.
>
> The 965 render acceleration is still broken in that for small objects
> (like text) it's slower than software.  Someone with the time needs to
> fix that problem, by queuing up multiple primitives in a single vertex
> buffer, so that we don't sync the chip every primitive.  There's a
> commit attempting that in
>
> git://people.freedesktop.org:~anholt/xf86-video-intel
>
> on the 965-render-vb branch, but it's been done better in
> intel-batchbuffer (emitting larger primitive lists).
>
> Until someone fixes the driver problem, I would be opposed to use of the
> 965 as a metric for changing server defaults.
>
>> By drastically, I mean it -- a redraw of a full-screen Firefox goes
>> from 3 to 5 seconds (!) down to a fraction of a second.
>>
>> Now I haven't read the sources of Firefox (let him who has cast me the
>> first stone), but I believe that Firefox performs client-side backing
>> store using absolutely humonguous pixmaps.  While we may argue that
>> what Firefox does is stupid, I think we should try to support this
>> kind of usage.
>>
>> Isn't the default value of MigrationHeuristic incorrect ?  Should we
>> switch to greedy as default ?  (Julien tells me that he believes that
>> Ubuntu have already made the switch.)
>>
>>                                         Juliusz
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> --
> Eric Anholt                             anholt at FreeBSD.org
> eric at anholt.net                         eric.anholt at intel.com
>
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