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. Kernbench log for Vanilla 3.7-rc3 ================================= Kernel: 3.7.0-rc3-vanilla-default Average Optimal load -j 32 Run (std deviation): Elapsed Time 650.742 (2.49774) User Time 8213.08 (17.6347) System Time 1273.91 (6.00643) Percent CPU 1457.4 (3.64692) Context Switches 2250203 (3846.61) Sleeps 1.8781e+06 (5310.33) Kernbench log for this sorted-buddy patchset ============================================ Kernel: 3.7.0-rc3-sorted-buddy-default Average Optimal load -j 32 Run (std deviation): Elapsed Time 591.696 (0.660969) User Time 7511.97 (1.08313) System Time 1062.99 (1.1109) Percent CPU 1448.6 (1.94936) Context Switches 2.1496e+06 (3507.12) Sleeps 1.84305e+06 (3092.67) 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>