Hi Joonsoo,
On Mon, Jan 06, 2014 at 09:30:52AM +0900, Joonsoo Kim wrote:
> On Sun, Jan 05, 2014 at 05:04:56PM +0800, fengguang...@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())?
Yes, b0cff9d completely restores the performance. Sorry for the noise!
Thanks,
Fengguang
> >
> > 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-----------------------------------------------+
> >
> > --
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