Messages in this thread | | | Date | Mon, 23 Aug 2004 20:26:13 -0700 | From | "Martin J. Bligh" <> | Subject | Re: Performance of -mm2 and -mm4 |
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> Martin J. Bligh wrote: > >> 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-mm1 44.26 87.71 574.73 1496.33 >> 2.6.8.1-mm2 44.27 90.27 574.84 1502.33 >> 2.6.8.1-mm4 45.87 97.60 595.23 1510.00 >> >> mm2 seems to take slightly (but consistently) more systime than mm1, and >> mm4 is significantly worse still ;-( >> >> > > Increasing base_timeslice here takes about 10s off the user time, > and maybe 1-2 off elapsed. You may see a better improvement because > the machine I'm testing on has very small caches; I assume you are > using a 32-way NUMAQ with 1-2MB caches?
16-way with 2MB caches. Doing 256 as opposed to 64 gives a little less user time, more systime at the low end, and a wash with more tasks. Not much affects elapsed though. I'll try 16, then backing out the sched patch, and what Jesse suggested as well.
M.
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