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Date: Mon, 3 May 2010 19:04:22 +1000 From: Con Kolivas <kernel@...ivas.org> To: linux-kernel@...r.kernel.org Subject: [ANNOUNCE] BFS cpu scheduler v0.316 This is to briefly announce the immediate availability of the desktop interactivity focused BFS CPU scheduler version 0.316 which is a minor bugfix. The only changes since version 0.315 affect performance on uniprocessor machines. A long-standing bug was found that would prevent tasks being woken up and scheduled properly on very idle machines when woken up by network activity (and the like) only. This would cause great lag when the only activity happening on the machine was network based (such as a network based install or ssh session). Thanks to Byron Stanoszek for spotting the bug and testing the fix which has been present for some time (since bfs 0.232). Surprisingly, only 2 people have reported this bug in the last 5 months meaning either this was a rare workload, or there are very few uniprocessor BFS machines out there, or people just don't report bugs. I suspect it was a combination of all of the above. The change to 0.316 will not have any effect on kernels built with SMP support. Fortunately, all pclinuxOS kernels (the largest current distribution using BFS in its kernels) are built with SMP support enabled so will not suffer from this bug. However, all -ck users for the last 2 kernels with kernels built with uniprocessor support will be affected. I will probably be providing new -ck kernels with this one bugfix in the near future. Versions are available for 2.6.32 and 2.6.33 http://ck.kolivas.org/patches/bfs/2.6.32-sched-bfs-316.patch http://ck.kolivas.org/patches/bfs/2.6.33-sched-bfs-316.patch Also, Richard Ross has kindly provided a patch for 2.6.27 for hero HTC android users: http://ck.kolivas.org/patches/bfs/Unofficial-BFS-316-HEROC-2.6.27.patch Regards, Con -- -ck -- 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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