Messages in this thread | | | Date | Wed, 25 Aug 2004 15:29:38 -0700 | From | "Martin J. Bligh" <> | Subject | Re: Performance of -mm2 and -mm4 |
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>>>> The -mm4 looks more like sched stuff to me (copy_to/from_user, etc), >>>> but the -mm2 stuff looks like something else. Buggered if I know what. >>>> -mm3 didn't compile cleanly, so I didn't bother, but I prob can if you >>>> like. >>>> >>> >>> If you suspect the scheduler, you could try bumping SD_NODES_PER_DOMAIN in >>> kernel/sched.c to a larger value (e.g. the number of nodes in your system). >>> That'll make the scheduler balance more aggressively across the whole system. >>> >>> >> >> Try increasing /proc/sys/kernel/base_timeslice as well. > > Or back out nicksched.patch
Yeah, that mostly fixed it.
Kernbench: (make -j N vmlinux, where N = 16 x num_cpus) Elapsed System User CPU 2.6.8.1 44.82 97.19 574.55 1497.33 2.6.8.1-mm4 46.82 107.47 594.15 1497.33 2.6.8.1-mm4-nn 44.93 96.33 576.44 1496.33
Kernbench: (make -j vmlinux, maximal tasks) Elapsed System User CPU 2.6.8.1 43.90 87.76 572.94 1505.67 2.6.8.1-mm4 45.87 97.60 595.23 1510.00 2.6.8.1-mm4-nn 44.53 90.71 575.68 1495.67
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