On Fri, Jun 14, 2013 at 03:31:25PM -0700, Tejun Heo wrote: > I'll play with it a bit more on an actual machine and post more > results. Test program attached.
So, here are the results from the same test on a dual-socket 2-way NUMA opteron 8 core machine. Running on one CPU. copy size atomic percpu diff in pct 0 535964443 616756827 +15.07% 32 399988186 378678713 -5.33% 64 389067476 355073979 -8.74% 128 342192631 315615300 -7.77% 256 281208005 260598931 -7.33% 512 188070912 193225269 +2.74% Running on all eight cores. copy size atomic percpu diff in pct 0 121324328 4889425511 +3,930.05% 32 96170193 2999613380 +3,019.07% 64 98139061 2813894184 +2,767.25% 128 112610025 2503229487 +2,122.92% 256 96828114 2069865752 +2,037.67% 512 95858297 1537726109 +1,504.17% Ration of all cores / single core. copy size atomic percpu 0 0.23 7.93 32 0.24 7.92 64 0.25 7.92 128 0.33 7.93 256 0.34 7.94 512 0.51 7.96 Note exactly 8 - the cores do share quite a bit of resources after all - but pretty close. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
