Messages in this thread | | | Subject | Re: PostgreSQL pgbench performance regression in 2.6.23+ | From | Mike Galbraith <> | Date | Thu, 22 May 2008 13:25:53 +0200 |
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On Thu, 2008-05-22 at 12:34 +0200, Mike Galbraith wrote:
> (Nadia's ipc/idr patches are applied though, to see if the high end > improves over previous runs with various kernels, and it does seem to.)
Disregard the above, no they don't. (now removed again)
However. The problem with 2.6.26.git running this testcase appears to be SYNC_WAKEUPS. No taskset, nada except echo 863 > sched_features 2.6.26.git 1 8173.538610 2 15738.206889 3 23399.356839 4 21401.182501 5 21682.839897 6 26396.301413 8 29910.334798 10 29953.625797 15 29535.740343 20 28950.900431 30 27159.733949 40 24163.344207 50 23258.496794
vs
2.6.22.17-0.1-default (opensuse 10.3 stock kernel) 1 7693.501369 2 15669.304960 3 25340.818410 4 24445.932930 5 22807.019544 6 24051.387364 8 22406.392813 10 22631.510576 15 21225.243584 20 20382.232075 30 18834.814588 40 17799.906622 50 17305.274561
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