Bug 15491

Summary: Performance problems with current X server and unaccelerated drivers
Product: xorg Reporter: Bernhard Rosenkraenzer <bero>
Component: Server/GeneralAssignee: Xorg Project Team <xorg-team>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

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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