Messages in this thread | | | Date | Mon, 23 Dec 2013 13:24:26 +0800 | From | Fengguang Wu <> | Subject | Re: [sched] perf-stat.cpu-migrations changes in dd write test |
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On Mon, Dec 23, 2013 at 01:19:04PM +0800, Alex Shi wrote: > On 12/22/2013 08:30 AM, fengguang.wu@intel.com wrote: > > Alex, > > > > We noticed some perf-stat.cpu-migrations changes by your commit > > Thanks for your wonder testing, Fengguang! > How many CPU in your system and how many dd task running?
For the case
kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
It's a KVM with 4 CPUs, 16G memory. There are 4 virtual disks, on top of each disk there runs 10 dd tasks.
Thanks, Fengguang
> > > > 6eb8b571283e64e96ca1a91aad085f9e08f857f0 is the first bad commit > > commit 6eb8b571283e64e96ca1a91aad085f9e08f857f0 > > Author: Alex Shi <alex.shi@linaro.org> > > Date: Tue Nov 19 20:29:51 2013 +0800 > > > > sched: remove rq->cpu_load[load_idx] array > > > > Since load_idx effect removed in load balance, we don't need the > > load_idx decays in scheduler. that will save some process in sched_tick > > and others places. > > > > Signed-off-by: Alex Shi <alex.shi@linaro.org> > > > > > > Here are the changed stats comparing to its parent commit: > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 37779 ~40% +115.2% 81288 ~50% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 37779 +115.2% 81288 TOTAL proc-vmstat.pgscan_direct_normal > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: proc-vmstat.pgscan_direct_normal > > > > 160000 ++----------------------------------------------------------------+ > > | | > > 140000 ++ O > > | | > > 120000 ++ | > > | O | > > 100000 ++ | > > | | > > 80000 ++ O | > > | ..* > > 60000 ++ .... | > > | .... | > > 40000 *+............... O .... | > > O *............... ........*. | > > 20000 ++-------------------------------*--------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 121579 ~ 6% -50.8% 59852 ~13% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 121579 -50.8% 59852 TOTAL softirqs.SCHED > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: softirqs.SCHED > > > > 140000 ++----------------------------------------------------------------+ > > 130000 ++ ....*........... ....*....... | > > | ........ .... ........ ...... | > > 120000 *+... *.... ..| > > 110000 ++ * > > | | > > 100000 ++ | > > 90000 ++ | > > 80000 ++ | > > | | > > 70000 ++ O O | > > 60000 ++ O | > > | O > > 50000 O+ | > > 40000 ++----------------------------------------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 5636 ~ 4% -22.1% 4392 ~17% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 5636 -22.1% 4392 TOTAL proc-vmstat.nr_tlb_remote_flush > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: proc-vmstat.nr_tlb_remote_flush > > > > 6500 ++------------------------------------------------------------------+ > > | | > > 6000 ++ ........*............ | > > *........ .... | > > 5500 ++ O *................*................| > > | * > > 5000 ++ O | > > | | > > 4500 ++ O | > > | | > > 4000 ++ | > > | O > > 3500 O+ | > > | | > > 3000 ++------------------------------------------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 5679 ~ 4% -21.9% 4437 ~17% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 5679 -21.9% 4437 TOTAL proc-vmstat.nr_tlb_remote_flush_received > > > > > > > > 6500 ++------------------------------------------------------------------+ > > | | > > 6000 ++ ........*........ | > > *........ ...... | > > | .. ........*................| > > 5500 ++ O *........ * > > | | > > 5000 ++ O | > > | | > > 4500 ++ O | > > | | > > | | > > 4000 ++ | > > | O > > 3500 O+------------------------------------------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 167 ~11% +19.4% 200 ~ 4% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 167 +19.4% 200 TOTAL uptime.idle > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: uptime.idle > > > > 220 ++-------------------------------------------------------------------+ > > | O > > 210 ++ | > > 200 O+ O | > > | ..*..... O | > > 190 ++ .... O ... | > > 180 ++ .... .... | > > | .... .... | > > 170 *+. . .* > > 160 ++ *...... .... | > > | .... ... | > > 150 ++ .... ... | > > 140 ++ .. .... | > > | *. | > > 130 ++-------------------------------------------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 154781 ~ 5% -66.8% 51449 ~ 8% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 154781 -66.8% 51449 TOTAL perf-stat.cpu-migrations > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: perf-stat.cpu-migrations > > > > 180000 ++----------------------------------------------------------------+ > > | ....*........... | > > 160000 ++ ........ .... ........*...............| > > *.... *........ * > > 140000 ++ | > > | | > > 120000 ++ | > > | | > > 100000 ++ | > > | | > > 80000 ++ | > > | | > > 60000 ++ O | > > | O O O > > 40000 O+----------------------------------------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 1943 ~ 3% -7.8% 1792 ~ 4% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 1943 -7.8% 1792 TOTAL vmstat.system.cs > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: vmstat.system.cs > > > > 2050 ++------------------------------------------------------------------+ > > | ........*................*..... | > > 2000 ++ .*........ ... | > > 1950 ++ .... ... | > > | ... .... | > > 1900 ++ ... .| > > 1850 ++.... O O * > > *. | > > 1800 ++ O O > > 1750 ++ | > > | | > > 1700 ++ | > > 1650 O+ | > > | | > > 1600 ++------------------------------------------------------------------+ > > > > > > 1de157d718f6494 6eb8b571283e64e96ca1 > > --------------- ------------------------- > > 1216177 ~ 3% -9.4% 1101605 ~ 7% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd > > 1216177 -9.4% 1101605 TOTAL perf-stat.context-switches > > > > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: perf-stat.context-switches > > > > 1.3e+06 ++--------------------------------------------------------------+ > > | ..*............... | > > 1.25e+06 ++ ...... *...............*....... | > > | ..... ...... | > > 1.2e+06 *+. O ..| > > 1.15e+06 ++ O * > > | O | > > 1.1e+06 ++ | > > | O > > 1.05e+06 ++ | > > 1e+06 ++ | > > | | > > 950000 O+ | > > | | > > 900000 ++--------------------------------------------------------------+ > > > > > > > -- > Thanks > Alex
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