Rob, I gather this was with the complete -ck patchset? It would be interesting to see if just SD performed as well. If it does, CFS needs more work. if not there are other things in -ck that really do improve performance and should be looked into.
Thanks Ed Tomlinson On September 17, 2007, Rob Hussey wrote: > Hi all, > > After posting some benchmarks involving cfs > (http://lkml.org/lkml/2007/9/13/385), I got some feedback, so I > decided to do a follow-up that'll hopefully fill in the gaps many > people wanted to see filled. > > This time around I've done the benchmarks against 2.6.21, 2.6.22-ck1, > and 2.6.23-rc6-cfs-devel (latest git as of 12 hours ago). All three > .configs are attached. The benchmarks consist of lat_ctx and > hackbench, both with a growing number of processes, as well as > pipe-test. All benchmarks were also run bound to a single core. > > Since this time there are hundreds of lines of data, I'll post a > reasonable amount here and attach the data files. There are graphs > again this time, which I'll post links to as well as attach. > > I'll start with some selected numbers, which are preceded by the > command used for the benchmark. > > for((i=2; i < 201; i++)); do lat_ctx -s 0 $i; done: > (the left most column is the number of processes ($i)) > > 2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel > > 15 5.88 4.85 5.14 > 16 5.80 4.77 4.76 > 17 5.91 4.84 4.92 > 18 5.79 4.86 4.83 > 19 5.89 4.94 4.93 > 20 5.78 4.81 5.13 > 21 5.88 5.02 4.94 > 22 5.79 4.79 4.84 > 23 5.93 4.86 5.05 > 24 5.73 4.76 4.90 > 25 6.00 4.94 5.19 > > for((i=1; i < 100; i++)); do hackbench $i; done: > > 2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel > > 80 9.75 8.95 9.52 > 81 11.54 8.87 9.57 > 82 11.29 8.92 9.67 > 83 10.76 8.96 9.82 > 84 12.04 9.20 9.91 > 85 11.74 9.39 10.09 > 86 12.01 9.37 10.18 > 87 11.39 9.43 10.13 > 88 12.48 9.60 10.38 > 89 11.85 9.77 10.52 > 90 13.78 9.76 10.65 > > pipe-test: > (the left most column is the run #) > > 2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel > > 1 13.84 12.59 13.01 > 2 13.90 12.57 13.00 > 3 13.84 12.62 13.06 > 4 13.87 12.61 13.04 > 5 13.82 12.62 13.03 > 6 13.86 12.60 13.02 > 7 13.85 12.61 13.02 > 8 13.88 12.45 13.04 > 9 13.83 12.46 13.03 > 10 13.88 12.46 13.03 > > Bound to Single core: > > for((i=2; i < 201; i++)); do lat_ctx -s 0 $i; done: > > 2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel > > 15 2.90 2.76 2.21 > 16 2.88 2.79 2.36 > 17 2.87 2.77 2.52 > 18 2.86 2.78 2.66 > 19 2.89 2.72 2.81 > 20 2.87 2.72 2.95 > 21 2.86 2.69 3.10 > 22 2.88 2.72 3.26 > 23 2.86 2.71 3.39 > 24 2.84 2.72 3.56 > 25 2.82 2.73 3.72 > > > for((i=1; i < 100; i++)); do hackbench $i; done: > > 2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel > > 80 14.29 10.86 12.03 > 81 14.40 11.25 12.17 > 82 15.00 11.42 12.33 > 83 14.87 11.12 12.51 > 84 15.37 11.42 12.66 > 85 15.75 11.68 12.79 > 86 15.64 11.95 12.95 > 87 15.80 11.64 13.12 > 88 15.70 11.91 13.25 > 89 15.10 12.19 13.42 > 90 16.24 12.53 13.54 > > pipe-test: > > 2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel > > 1 9.27 8.50 8.55 > 2 9.27 8.47 8.55 > 3 9.28 8.47 8.54 > 4 9.28 8.48 8.54 > 5 9.28 8.48 8.54 > 6 9.29 8.46 8.54 > 7 9.28 8.47 8.55 > 8 9.29 8.47 8.55 > 9 9.29 8.45 8.54 > 10 9.28 8.46 8.54 > > Links to the graphs (the .dat files are in the same directory): > http://www.healthcarelinen.com/misc/benchmarks/lat_ctx_benchmark2.png > http://www.healthcarelinen.com/misc/benchmarks/hackbench_benchmark2.png > http://www.healthcarelinen.com/misc/benchmarks/pipe-test_benchmark2.png > http://www.healthcarelinen.com/misc/benchmarks/BOUND_lat_ctx_benchmark2.png > http://www.healthcarelinen.com/misc/benchmarks/BOUND_hackbench_benchmark2.png > http://www.healthcarelinen.com/misc/benchmarks/BOUND_pipe-test_benchmark2.png > > The only analysis I'll offer is that both sd and cfs are improvements, > and I'm glad that there is a lot of work being done in this area of > linux development. Much respect to Con Kolivas, Ingo Molnar, and Roman > Zippel, as well all the others who have contributed. > > Any feedback is welcome. > > Regards, > Rob > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
