Dissecting performance regression on Gnome with Gen4 Intel GM45

Rim Botede rimblin at outlook.com
Mon May 5 19:54:57 UTC 2014


The subject performance regression:
https://bugs.freedesktop.org/show_bug.cgi?id=77372

Hello everyone!
This is my first use of mailing lists. I'm a novice-to-intermediate linux user. I've been contributing only by sharing basic knowledge and solutions on askubuntu.com and ask.fedoraproject.org.

I need your help with dissecting the performance regression i.e. identifying the faulty component. It's far beyond my skills to do it on my own. I can provide system information and command line outputs but I couldn't e.g. downgrade xserver to a specific version or do a selective update of only Gnome Shell, only graphics driver etc.

Why devel list?
I've been asking for help with the subject for some time now on fedora forums, arch forums and phoronix forums and it haven't moved me significantly closer to identification of the component at fault.


Regression summary:
1. Introduced between Fedora 18 and Fedora 19 releases. Clean Fedora 18 showing no performance problems, clean Fedora 19 being affected by the regression.
2. A system install (e.g. Fedora 19) affected by the regression shows no performance problems under KDE. The difference in desktop animation smoothness is striking. No need for telemetry.
3. A Gnome Shell developer (drago01) could not reproduce the bug on his Intel GM45 system.

I've done some F18 vs F19 vs Arch benchmarking / Gnome vs LXDE using Xonotic in windowed mode but the results were nowhere near as conclusive as #2.

I'd really appreciate a thorough assistance with this issue. 

Regards,
rim
 		 	   		  
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