On 11/09/2012 10:13 PM, Srivatsa S. Bhat wrote: > On 11/09/2012 10:04 PM, Srivatsa S. Bhat wrote: >> On 11/09/2012 09:43 PM, Dave Hansen wrote: >>> On 11/09/2012 07:23 AM, Srivatsa S. Bhat wrote: >>>> FWIW, kernbench is actually (and surprisingly) showing a slight performance >>>> *improvement* with this patchset, over vanilla 3.7-rc3, as I mentioned in >>>> my other email to Dave. >>>> >>>> https://lkml.org/lkml/2012/11/7/428 >>>> >>>> I don't think I can dismiss it as an experimental error, because I am seeing >>>> those results consistently.. I'm trying to find out what's behind that. >>> >>> The only numbers in that link are in the date. :) Let's see the >>> numbers, please. >>> >> >> Sure :) The reason I didn't post the numbers very eagerly was that I didn't >> want it to look ridiculous if it later turned out to be really an error in the >> experiment ;) But since I have seen it happening consistently I think I can >> post the numbers here with some non-zero confidence. >> >>> If you really have performance improvement to the memory allocator (or >>> something else) here, then surely it can be pared out of your patches >>> and merged quickly by itself. Those kinds of optimizations are hard to >>> come by! >>> >> >> :-) >> >> Anyway, here it goes: >> >> Test setup: >> ---------- >> x86 2-socket quad-core machine. (CONFIG_NUMA=n because I figured that my >> patchset might not handle NUMA properly). Mem region size = 512 MB. >> > > For CONFIG_NUMA=y on the same machine, the difference between the 2 kernels > was much lesser, but nevertheless, this patchset performed better. I wouldn't > vouch that my patchset handles NUMA correctly, but here are the numbers from > that run anyway (at least to show that I really found the results to be > repeatable): > > Kernbench log for Vanilla 3.7-rc3 > ================================= > Kernel: 3.7.0-rc3-vanilla-numa-default > Average Optimal load -j 32 Run (std deviation): > Elapsed Time 589.058 (0.596171) > User Time 7461.26 (1.69702) > System Time 1072.03 (1.54704) > Percent CPU 1448.2 (1.30384) > Context Switches 2.14322e+06 (4042.97) > Sleeps 1847230 (2614.96) > > Kernbench log for Vanilla 3.7-rc3 > ================================= Oops, that title must have been "for sorted-buddy patchset" of course.. > Kernel: 3.7.0-rc3-sorted-buddy-numa-default > Average Optimal load -j 32 Run (std deviation): > Elapsed Time 577.182 (0.713772) > User Time 7315.43 (3.87226) > System Time 1043 (1.12855) > Percent CPU 1447.6 (2.19089) > Context Switches 2117022 (3810.15) > Sleeps 1.82966e+06 (4149.82) > > Regards, Srivatsa S. Bhat -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>