Messages in this thread | | | Date | Tue, 24 Feb 2004 16:20:52 -0800 | From | cliff white <> | Subject | reaim - 2.6.3-mm1 IO performance down. |
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Running the reaim 'new_fserver' workload, we now see a performance drop on 2.6.3-mm1, ext3 filesystem
Kernel JPM Max Users Percent change inux-2.6.3 10347.87 172 0.0 2.6.3-rc3-mm1 9826.35 164 -5.07 2.6.3-mm1 8938.17 140 (run 1) -13.65 2.6.3-mm1 9100.39 136 (run 2)-12.08
I have done some comparions graphs here, with readprofile data: http://developer.osdl.org/cliffw/reaim/compares/r_comp/2.6.3_vs_mm1_r1/index.html http://developer.osdl.org/cliffw/reaim/compares/r_comp/2.6.3_vs_mm1_r2/index.html
The interesting graph is the bottom one on the page, comparing client run-time to number of children. The -mm1 kernel has a spike in run time, becoming very noticealbe around 60-80 lusers.
kernel Users JPM Run Time linux-2.6.3 60 10327.87 34.16 seconds 2.6.3-mm1 60 8279.75 42.61 seconds
Linux-2.6.3 80 10275.23 45.78 seconds 2.6.3-mm1 80 7841.31 59.99 seconds
For the same test on the same machine, results from 2.6.2-rc1-mm2 and 2.6.2-rc3-mm1 were within 1.0% of the linux-2.6.2 runs. So this is new.
More data and tests if requested - are there some patch sets we should try reverting? cliffw
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