From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adam Jackson <ajax@redhat.com>
Subject: Re: X11 performance regressions
Date: Mon, 09 May 2011 12:53:57 -0400
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To: Knut Petersen <Knut_Petersen@t-online.de>
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On 5/8/11 2:22 PM, Knut Petersen wrote:

> Software
> =======
> 1.86 MHz system:
> opensuse 11.2
> X.Org X Server 1.6.5
> Release Date: 2009-10-11
> kernel 2.6.38.5
>
> 2.00 MHz system:
> opensuse 11.4
> X.Org X Server 1.10.99
> git-tree, 2011-may-7
> kernel 2.6.39-rc4-drm-intel-staging

I'd start by suspecting differences in .config for the kernel between 
the two, particularly since...

> 10000000 trep @   0.0032 msec (309000.0/sec): Dot
> 40000000 trep @   0.0006 msec (1650000.0/sec): Dot

Dot dispatch is so completely CPU-dominated that I suspect you're simply 
measuring CPU overhead somewhere else.  For example, if one of those 
kernels is built with spinlock debugging and the other isn't.

- ajax