On Mon, Dec 10, 2012 at 08:15:45PM +0100, Ingo Molnar wrote: > > * Rik van Riel <riel@xxxxxxxxxx> wrote: > > > On 12/10/2012 01:22 PM, Thomas Gleixner wrote: > > > > > So autonuma and numacore are basically on the same page, > > > with a slight advantage for numacore in the THP enabled > > > case. balancenuma is closer to mainline than to > > > autonuma/numacore. > > > > Indeed, when the system is fully loaded, numacore does very > > well. > > Note that the latest (-v3) code also does well in under-loaded > situations: > > http://lkml.org/lkml/2012/12/7/331 > > Here's the 'perf bench numa' comparison to 'balancenuma': > > balancenuma | NUMA-tip > [test unit] : -v10 | -v3 > ------------------------------------------------------------ > 2x1-bw-process : 6.136 | 9.647: 57.2% > 3x1-bw-process : 7.250 | 14.528: 100.4% > 4x1-bw-process : 6.867 | 18.903: 175.3% > 8x1-bw-process : 7.974 | 26.829: 236.5% > 8x1-bw-process-NOTHP : 5.937 | 22.237: 274.5% > 16x1-bw-process : 5.592 | 29.294: 423.9% > 4x1-bw-thread : 13.598 | 19.290: 41.9% > 8x1-bw-thread : 16.356 | 26.391: 61.4% > 16x1-bw-thread : 24.608 | 29.557: 20.1% > 32x1-bw-thread : 25.477 | 30.232: 18.7% > 2x3-bw-thread : 8.785 | 15.327: 74.5% > 4x4-bw-thread : 6.366 | 27.957: 339.2% > 4x6-bw-thread : 6.287 | 27.877: 343.4% > 4x8-bw-thread : 5.860 | 28.439: 385.3% > 4x8-bw-thread-NOTHP : 6.167 | 25.067: 306.5% > 3x3-bw-thread : 8.235 | 21.560: 161.8% > 5x5-bw-thread : 5.762 | 26.081: 352.6% > 2x16-bw-thread : 5.920 | 23.269: 293.1% > 1x32-bw-thread : 5.828 | 18.985: 225.8% > numa02-bw : 29.054 | 31.431: 8.2% > numa02-bw-NOTHP : 27.064 | 29.104: 7.5% > numa01-bw-thread : 20.338 | 28.607: 40.7% > numa01-bw-thread-NOTHP : 18.528 | 21.119: 14.0% > ------------------------------------------------------------ > > More than half of these testcases are under-loaded situations. > > > The main issues that have been observed with numacore are when > > the system is only partially loaded. Something strange seems > > to be going on that causes performance regressions in that > > situation. > > I haven't seen such reports with -v3 yet, which is what Thomas > tested. Mel has not tested -v3 yet AFAICS. > Yes, I have. The drop I took and the results I posted to you were based on a tip/master pull from December 9th. v3 was released on December 7th and your release said to test based on tip/master. The results are here https://lkml.org/lkml/2012/12/9/108 . Look at the columns marked numafix-20121209 which is tip/master with a bodge on top to remove the "if (p->nr_cpus_allowed != num_online_cpus())" check. To my continued frustration, the results begin at the line "Here is the comparison on the rough off-chance you actually read it this time." I guess you didn't feel the need. > If there are any such instances left then I'll investigate, but > right now it's looking pretty good. > If you had read that report, you would know that I didn't have results for specjbb with THP enabled due to the JVM crashing with null pointer exceptions. -- Mel Gorman SUSE Labs -- 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>