Poor compositing performance on 965Q chipset with intel 2.2.1 driver

Keith Packard keithp at keithp.com
Fri May 9 07:39:47 PDT 2008

On Fri, 2008-05-09 at 14:11 +0100, Barry Scott wrote:

> Using latest libpciaccess makes no difference MTRR status is the same:

It's not the MTRRs that are broken, it's the page mapping which is
setting the ignore cache and write through bits on each page mapped by
libpciaccess. There's a kludge-around which takes advantage of a
different kernel bug to clear those bits. A simple test:

$ x11perf -shmput500

If that gives you a number significantly less than 1000, then your pages
are probably mis-mapped.

keith.packard at intel.com
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