Messages in this thread | | | Subject | Re: 2.6.4-mm2 | From | Mary Edie Meredith <> | Date | Tue, 30 Mar 2004 13:30:52 -0800 |
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The 2.6.5-rc2-mm5 kernel has vastly improved the performance issue with dbt3-pgsql throughput numbers (bigger is better):
Runid...Metric.PLM..Kernel........diff% 290357 141.84 2788 2.6.5-rc2..... base 290576 91.18 2814 2.6.5-rc2-mm2 -35.72 290856 60.02 2842 2.6.5-rc2-mm4 -57.68 290953 134.10 2849 2.6.5-rc2-mm5 -5.46 <-------
Thanks to Nick and Ingo.
On Tue, 2004-03-23 at 16:07, Mary Edie Meredith wrote: > On Tue, 2004-03-23 at 11:32, Andrew Morton wrote: > > Mary Edie Meredith <maryedie@osdl.org> wrote: > > > > > > > 36% regression due to the CPU scheduler changes? ow. > > > > > > > > And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT > > > > makes no difference. > > > > > > > > >From a quick look at the material you have there it appears that this > > > > workload also is very I/O bound. It's a little surprising that the CPU > > > > scheduler could make so much difference. > > > I'm not sure why you think this is IO bound. For > > > the throughput phase of the test (from which the > > > metric above is taken) there is very little physical > > > IO except at the start when the updates occur. They > > > finish in a few minutes, after which there is very > > > little. > > > > > > http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat_io.png > > > http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat.txt > > > > There seems to be a large amount of idle time in the profiles and in the > > vmstat trace. > Yes. There is considerably more idle time in the bad run: > Good one: > http://khack.osdl.org/stp/290298/results/plot/thuput.sar_cpu_all.png > Bad one: > http://khack.osdl.org/stp/290304/results/plot/thuput.sar_cpu_all.png > > I am concerned with the drop in CPU utilization relative to > the other run. -- Mary Edie Meredith maryedie@osdl.org 503-626-2455 x42 Open Source Development Labs
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