Messages in this thread | | | Date | Mon, 6 Jan 2014 09:30:52 +0900 | From | Joonsoo Kim <> | Subject | Re: [sched] 23f0d2093c: -12.6% regression on sparse file copy |
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On Sun, Jan 05, 2014 at 05:04:56PM +0800, fengguang.wu@intel.com wrote: > Hi Joonsoo, > > We noticed the below changes for commit 23f0d2093c ("sched: Factor out > code to should_we_balance()") in test vm-scalability/300s-lru-file-readtwice
Hello, Fengguang.
There was a mistake in this patch and there was a fix and it was already merged into mainline.
Could you test again with the commit (b0cff9d sched: Fix load balancing performance regression in should_we_balance())?
Thanks.
> > 95a79b805b935f4 23f0d2093c789e612185180c4 > --------------- ------------------------- > ==> 4.45 ~ 5% +1777.7% 83.60 ~ 5% vm-scalability.stddev > ==> 14966511 ~ 0% -12.6% 13084545 ~ 2% vm-scalability.throughput > 38 ~ 9% +406.3% 193 ~ 7% proc-vmstat.kswapd_low_wmark_hit_quickly > 610823 ~ 0% -41.4% 357990 ~ 0% softirqs.SCHED > 5.424e+08 ~ 0% -38.5% 3.338e+08 ~ 6% proc-vmstat.pgdeactivate > 4.68e+08 ~ 0% -37.5% 2.924e+08 ~ 6% proc-vmstat.pgrefill_normal > 5.549e+08 ~ 0% -37.1% 3.491e+08 ~ 6% proc-vmstat.pgactivate > 14938509 ~ 1% +27.0% 18974176 ~ 1% vmstat.memory.free > 978771 ~ 1% +23.9% 1212704 ~ 3% numa-vmstat.node2.nr_free_pages > 3747434 ~ 0% +21.7% 4560196 ~ 2% proc-vmstat.nr_free_pages > ==> 1.353e+08 ~ 0% +18.8% 1.607e+08 ~ 0% proc-vmstat.numa_foreign > 1.353e+08 ~ 0% +18.8% 1.607e+08 ~ 0% proc-vmstat.numa_miss > 1.353e+08 ~ 0% +18.8% 1.607e+08 ~ 0% proc-vmstat.numa_other > 3936842 ~ 1% +22.2% 4812045 ~ 4% numa-meminfo.node2.MemFree > 21803812 ~ 0% +17.7% 25661536 ~ 4% numa-vmstat.node3.numa_foreign > 73701524 ~ 0% +15.0% 84769542 ~ 0% proc-vmstat.pgscan_direct_dma32 > 73700683 ~ 0% +15.0% 84768687 ~ 0% proc-vmstat.pgsteal_direct_dma32 > 3.101e+08 ~ 0% +11.2% 3.448e+08 ~ 0% proc-vmstat.pgsteal_direct_normal > 3.103e+08 ~ 0% +11.2% 3.449e+08 ~ 0% proc-vmstat.pgscan_direct_normal > 45613907 ~ 0% +12.6% 51342974 ~ 3% numa-vmstat.node0.numa_other > 795639 ~ 0% -48.6% 409113 ~13% time.voluntary_context_switches > 375 ~ 0% +6.1% 398 ~ 0% time.elapsed_time > 9427 ~ 0% -5.8% 8880 ~ 0% time.percent_of_cpu_this_job_got > > The test case basically does > > for i in `seq 1 $nr_cpu` > do > create_sparse_file huge-$i > dd if=huge-$i of=/dev/null & > dd if=huge-$i of=/dev/null & > done > > where nr_cpu=120 (test box is a 4-socket ivybridge system). > > The change looks stable, each point below is a sample run: > > vm-scalability.stddev > > 120 ++-------------------------------------------------------------------+ > | | > 100 ++ * * | > | *.*** : ** : * * * * * | > ** * *.** * : * :*.* :: .* : : * :* * : .* : .* * .**| > 80 ++ * * *. : * *: ** : :: : * :.* * * * ** : :* * > | * * : *** * * * :** | > 60 ++ * * | > | | > 40 ++ | > | | > | | > 20 ++ | > | O OO OO OOO O OO O | > 0 OO--O--O------OO----OO-----------------------------------------------+ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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