Bug 15491 - Performance problems with current X server and unaccelerated drivers
Summary: Performance problems with current X server and unaccelerated drivers
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Server/General (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Xorg Project Team
QA Contact: Xorg Project Team
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Reported: 2008-04-14 05:02 UTC by Bernhard Rosenkraenzer
Modified: 2008-06-24 08:07 UTC (History)
0 users

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Description Bernhard Rosenkraenzer 2008-04-14 05:02:24 UTC
Using an unaccelerated driver (vesa, radeonhd) with current git xserver is noticably slower than with Xserver 1.4 (you can actually watch how a window is drawn from top to bottom even on machines with very decent CPUs).

Performance with accelerated drivers (intel, ati) is roughly the same as with 1.4.
Comment 1 Adam Jackson 2008-06-24 08:07:50 UTC
This was libpciaccess using the sysfs maps for PCI BARs, and thus getting screwed by not getting write-combining.  Thanks linux!  You rock.


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