Profiling redraws with Xorg 1.5.99.3

[Erik Andrén]

2008/12/26 Peter Clifton <pcjc2 at cam.ac.uk>:
> Hi guys,
>
> I've been profiling some speed differences rendering pixel aligned
> (should be fast-path) cairo drawing, and happened across the fact that
> for my redraw test (which is running flat out), 13% of my total system
> time is spent in dixLookupPrivate.
>
> Is there anything which can be done to avoid the overhead of
> dixLookupPrivate?
>
> The overhead is spread over a number of callers, the top few being:
>
> exaPixmapIsOffscreen (Total 3.43%)
> exaDoMoveInPixmap    (Total 1.82%)
> exaDoMigration       (Total 1.17%)
>
> Now whether this is simply because my cairo rendering is slow, and
> causing lots of migration I don't know.. but I thought it would be of
> interest here.
>
> This is made with the Intel driver at the tip of the 1.6 branch, using
> EXA acceleration.
>
> Best wishes,
>

Perhaps you're struck by this bug:
http://bugs.freedesktop.org/show_bug.cgi?id=16647

Regards,
Erik

> --
> Peter Clifton
>
> Electrical Engineering Division,
> Engineering Department,
> University of Cambridge,
> 9, JJ Thomson Avenue,
> Cambridge
> CB3 0FA
>
> Tel: +44 (0)7729 980173 - (No signal in the lab!)
>
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