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Message-ID: <47DFE003.5040205@skyrush.com> Date: Tue, 18 Mar 2008 09:30:11 -0600 From: Joe Peterson <joe@...rush.com> To: linux-kernel@...r.kernel.org Subject: Re: Interactivity degrades with CONFIG_[FAIR]_GROUP_SCHED set in 2.6.24 and later Joe Peterson wrote: > When going from kernel 2.6.23 to 2.6.24, however, I noticed that > interactivity (namely the smoothness of mouse motion) was noticeably > less smooth under load. The most obvious case was while pulling down a > Subversion repository; the mouse would freeze for quite long periods > while being moved (i.e. a large fraction of a second), which never > happens under 2.6.23. I was using ZFS-FUSE on the partition I was > writing to, and it uses a lot of CPU at times, but 2.6.23 seems to > handle it better. I just made a couple of debug output files using the default CONFIG_GROUP_SCHED setting in 2.6.25-rc5-git (from 3/16): This one was done during a diff between two kernel source dirs: http://www.skyrush.com/downloads/linux-cfs-debug/cfs-debug-info-2008.03.18-06.37.44 This one was done during an svn checkout: http://www.skyrush.com/downloads/linux-cfs-debug/cfs-debug-info-2008.03.18-06.38.23 The latter one was done during a period exhibiting what felt like longer and more profound pauses in mouse movement, however, the first debug file shows several se.wait_max > 40. Both cases showed very choppy/jerky mouse movement with quite obvious freezes when moving the mouse in circles during the tests. Here is a snippet of the se.wait_max lines from the first file: se.wait_max : 0.000000 se.wait_max : 0.000000 se.wait_max : 7.375852 se.wait_max : 4.875690 se.wait_max : 7.211323 se.wait_max : 3.779489 se.wait_max : 2.770382 se.wait_max : 12.959876 se.wait_max : 3.524036 se.wait_max : 16.625484 se.wait_max : 73.991289 se.wait_max : 18.937293 se.wait_max : 6.955806 se.wait_max : 21.919110 se.wait_max : 6.922932 se.wait_max : 10.432544 se.wait_max : 76.222556 se.wait_max : 7.216472 se.wait_max : 90.987582 se.wait_max : 7.071110 se.wait_max : 16.332227 se.wait_max : 2.261235 se.wait_max : 67.892956 se.wait_max : 25.337064 se.wait_max : 44.180597 se.wait_max : 74.290628 se.wait_max : 12.631292 se.wait_max : 1.389533 se.wait_max : 3.653521 se.wait_max : 2.841697 se.wait_max : 16.234723 se.wait_max : 107.011747 se.wait_max : 110.638560 se.wait_max : 9.677538 se.wait_max : 15.852109 se.wait_max : 23.316106 se.wait_max : 18.428330 se.wait_max : 16.674552 se.wait_max : 110.630411 se.wait_max : 47.906824 se.wait_max : 74.191984 se.wait_max : 12.224021 se.wait_max : 2.184557 se.wait_max : 17.799343 se.wait_max : 17.670697 se.wait_max : 0.000000 se.wait_max : 0.000000 I hope these help; please let me know if I can help further or run more tests. -Thanks, Joe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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