Messages in this thread | | | Subject | Re: [patch v2 1/2] sched: check for prev_cpu == this_cpu before calling wake_affine() | From | Mike Galbraith <> | Date | Thu, 15 Apr 2010 07:17:21 +0200 |
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On Wed, 2010-04-14 at 13:45 -0700, Suresh Siddha wrote: > On Thu, 2010-04-01 at 23:20 -0700, Mike Galbraith wrote: > > Do you have a compute load bouncing painfully which this patch cures? > > > > I have no strong objections, and the result is certainly easier on the > > eye. If I were making the decision, I'd want to see some numbers. > > Mike, PeterZ, > > Finally got sometime to get back to this and provide some data backing > up my patch under discussion. Here are my test results: > > System is a two socket quad-core NHM-EP with SMT enabled and the > workload is specjbb2005. > > Warehouses Throughput > tip tip+proposed-fix > 1 35142 35027 > 2 73563 75977 > 3 105806 109836 > 4 133421 142490 > 5 152151 168888 > 6 164936 195392 > 7 184763 208155 > 8 192419 223846 > > PeterZ, I think the above clearly shows that we have a problem with the > current -tip code. Please consider the proposed patch (which can be > found at http://marc.info/?l=linux-kernel&m=127007936408754&w=2) > > Mike, with the above data, can I have your Ack for the patch?
Sure (not that you need it). A bit of abbreviated testing this morning showed no big hairy differences. A bit of loss to very fast switchers, but OTOH it improved ramp a bit for mysql/pgsql+oltp.
tip = v2.6.34-rc4-937-gba0b2c9 tip-x = tip + your patches
netperf TCP_RR unpinned tip 102877.39 102860.66 103210.25 avg 102982.76 1.000 tip-x 100926.59 100380.26 100536.35 avg 100614.40 .977
pinned tip 100181.70 100288.34 99711.16 avg 100060.40 1.000 tip-x 99347.12 100551.80 99827.22 avg 99908.71 .998
tbench 8 tip 1195.51 1194.49 1197.46 avg 1195.82 1.000 tip-x 1183.19 1188.00 1188.13 avg 1186.44 .992
mysql+oltp clients 1 2 4 8 16 32 64 128 256 tip 10424.24 20417.42 37151.84 36777.79 36442.06 36122.14 33803.15 30109.81 28368.75 11196.80 20443.43 37560.39 37358.14 36822.26 36132.95 34411.88 30349.47 28909.04 11204.02 20513.21 37550.11 37219.52 36840.44 36150.47 34445.02 30975.95 28840.59 tip avg 10941.68 20458.02 37420.78 37118.48 36701.58 36135.18 34220.01 30478.41 28706.12
tip-x 10331.62 20981.89 36768.45 36556.19 36069.56 35612.24 34100.70 30459.80 29043.76 11101.77 21153.77 37622.83 37228.68 36845.37 36256.04 34606.37 31287.36 28635.98 11076.66 21153.41 37703.80 37242.89 36842.93 36296.27 34733.06 30578.00 29313.10 tip-x avg 10836.68 21096.35 37365.02 37009.25 36585.95 36054.85 34480.04 30775.05 28997.61 vs tip .990 1.031 .998 .997 .996 .997 1.007 1.009 1.010
pgsql+oltp clients 1 2 4 8 16 32 64 128 256 tip 14683.30 30452.18 53826.68 53793.77 52931.67 51959.47 51326.82 49205.13 46884.50 16154.17 30811.46 54277.20 53916.07 52792.89 52031.80 50967.99 48757.04 46259.84 16151.36 29913.89 54071.21 53499.94 52707.50 51867.73 50887.40 49310.96 46544.42 tip avg 15662.94 30392.51 54058.36 53736.59 52810.68 51953.00 51060.73 49091.04 46562.92
tip-x 14641.30 31402.11 54267.43 53835.83 53024.57 51992.08 50336.10 49083.58 46662.24 16167.44 31427.53 54008.47 53685.56 52709.81 52131.85 50848.08 48824.32 45973.29 16259.76 31381.42 54327.51 53791.91 52857.70 51912.42 50941.33 49028.19 45938.22 tip-x avg 15689.50 31403.68 54201.13 53771.10 52864.02 52012.11 50708.50 48978.69 46191.25 vs tip 1.001 1.033 1.002 1.000 1.001 1.001 .993 .997 .992
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