I was able to bisect the performance regression, the commit which introduced it was:
commit 686018f283f1d131073ef5917213e6a8ac013f26 Author: Chris Wilson <[email protected]> Date: Tue Apr 12 08:23:04 2011 +0100 Turn relaxed-fencing off by default for older (pre-G33) chipset Are there plans to re-enable relaxed fencing again? Thanks, Clemens 2011/9/29 Clemens Eisserer <[email protected]>: > Hi, > > For quite some time now I experience slow scrolling on some pages when > using FireFox, > now I took the time to find the culprit. > The slow scrolling only manifests when maximizing FireFox' window > (screen size is 1920x1280), > and manifests in "after-scrolling" (scrolling although mouse already stopped). > During scrolling, X doesn't respond to new input. > > It seems with 2.15 there is a performance regression, causing some > pages to scroll slow. > On my system the following page scrolls slow: > http://news.orf.at/stories/2081416/2081417/, > especially if the small images on the top need to be repainted. > Also > > During slow scrolling, intel_gpu_top reports a completly busy ring (0% > idle), ring space at ~10% > and the following load: > Color clalculator: 99% > Bypass FIFO: 99% > Map filter: 97% > Intermediate Z: 62% > Windowizer: 55% > Pixel Shader: 1% > Setup engine: 1% > > My System is: > - Fedora Core 15 (updated) > - intel 2.15 & 2.16 (both show the slowdown, 2.14 was ok) > - Intel 945GM > - Core2Duo T7200 (2x2ghz, 4mb shared L2 cache) > > I pasted my Xorg.log to: http://pastebin.com/74NXbrTp > > Is there anything further I should try to track this problem down? > > Thank you in advance, Clemens > _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
