F16 slowness

Matthias Runge mrunge at matthias-runge.de
Fri Sep 9 08:15:51 UTC 2011


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On 08/09/11 16:08, Adam Jackson wrote:
> 
> I'm nearly sure it wasn't.
> 
> There have been two xserver updates between the 2011-05-11 snapshot
> and now.  In a quick review of the changes in that interval I can
> only find one change that looks even remotely like a performance
> improvement:
> 
> http://cgit.freedesktop.org/xorg/xserver/commit/?id=9504caf1c3243e3ab2eb7126bc2bb876a8f89918
>
>  And even that is pretty borderline.  It inhibits the normal
> implicit draw that the server would do on exposure processing when
> a window has a particular redirection mode set by the compositor,
> but a) when composited, exposures are extremely rare, essentially
> only happening when a window transitions from unmapped to mapped;
> and b) background paints are _cheap_, usually just a solid fill of
> the grey from your theme color, but even in the worst case just a
> tiled pixmap blit.
> 
> If all you're looking for is a "is config A faster than config B"
> kind of measurement, then something like
> 
Thank you for going into this.

> % x11perf -copypixwin{10,100,500}
> 
> isn't completely misleading, although it's not uncommon for
> successive x11perf runs to vary by up to 5%, and when composited
> the x11perf benchmarks require _very_ careful understanding of just
> what exactly you're measuring and can be wildly variable even
> within a single run.
> 
> I realize I'm begging to get inundated with x11perf scores by even 
> mentioning it.  Oh well.
> 
> - ajax
I didn't intend to run this on a daily basis whining about 5% loss,
hooraying for each win. I just tried to get nearer to this problem.
I'm pretty sure, nearly nobody would notice 10% deviation.

Looking at the bug report[1] knurd mentioned, I'll try a kernel 2.6.40
to see, what happens.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=735268

Matthias

- -- 
Matthias Runge <mrunge at matthias-runge.de>
               <mrunge at fedoraproject.org>
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