Bug 19738

Summary: [945GM] Any 3D app is slow in resolution higher than 800x600 with UXA+DRI2, due to tiling
Product: xorg Reporter: Vasily Khoruzhick <anarsoul>
Component: Driver/intelAssignee: Eric Anholt <eric>
Status: RESOLVED DUPLICATE QA Contact: Xorg Project Team <xorg-team>
Severity: major    
Priority: medium CC: bugzilla, colin, jbarnes, jcnengel, mrmazda, remi
Version: git   
Hardware: x86 (IA32)   
OS: Linux (All)   
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 20276    
Description Flags
Xorg.0.log none

Description Vasily Khoruzhick 2009-01-25 13:37:24 UTC
Created attachment 22239 [details]

Any 3D application is _really_ slow if it runs in window with size higher than 

Steps to reproduce:

1. Use gma950 hardware with xf86-video-intel from git and mesa from git, 
xorg-server-, libdrm from git, 2.6.28 kernel + 6 patches
2. Download and install secret maryo chronicles (or any game you like that 
uses 3D)
3. Disable fullscreen mode and set resolution to 800x600 - game should run 
4. Disable fullscreen mode and set resolution to 1024x768 (or higher) - game 
should became unplayable.
Comment 1 Eric Anholt 2009-01-27 17:45:12 UTC
Please attach dmesg with driver bugs.

The main problem I see from your log is that tiling isn't being set up.
Comment 2 Gordon Jin 2009-01-31 06:39:19 UTC
Will this be the performance issue fixed by jbarnes for DRI2?
Comment 3 Vasily Khoruzhick 2009-01-31 06:45:22 UTC
Can't check. With latest driver from git Xserver ( eats all swap and then all memory in ~5 minutes. I've rolled back to 2.6.1, I can provide dmesg info with it.
Comment 4 Vasily Khoruzhick 2009-03-01 03:46:47 UTC
Just tested with latest xf86-video-intel from git and kernel-2.6.29-rc6, and here's results:

With tiling enabled 3D performance is low even in resolutions below 800x600,
with tiling disabled 3D performance is OK in resolutions below 800x600, but is low in resolutions higher than 800x600.

My system uses dual channel memory in interleaved mode, can it be reason of low performance with tiling enabled?
Comment 5 Eric Anholt 2009-03-10 18:07:45 UTC

*** This bug has been marked as a duplicate of bug 16835 ***

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