Hi Ying, On 24/09/15 03:00, kernel test robot wrote: > FYI, we noticed the below changes on > > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core > commit 98d8fd8126676f7ba6e133e65b2ca4b17989d32c ("sched/fair: Initialize task > load and utilization before placing task on rq") > > > ========================================================================================= > tbox_group/testcase/rootfs/kconfig/compiler/nr_threads/mode/ipc: > > lkp-ws02/hackbench/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/1600%/process/pipe > > commit: > 231678b768da07d19ab5683a39eeb0c250631d02 > 98d8fd8126676f7ba6e133e65b2ca4b17989d32c > > 231678b768da07d1 98d8fd8126676f7ba6e133e65b > ---------------- -------------------------- > %stddev %change %stddev > \ | \ > 188818 ± 1% -20.8% 149585 ± 1% hackbench.throughput
[...] > > lkp-ws02: Westmere-EP > Memory: 16G > > > > > hackbench.time.involuntary_context_switches > > 3e+08 ++------------------------O---------------------------------------+ > O O O O O | > 2.5e+08 ++ O O O O O > | O O O O | > | O O O O | > 2e+08 ++ O | > | O | > 1.5e+08 ++ | > | | > 1e+08 ++ | > | .*...*..*..*...*..* | > *..*...*..*..*...*.. .*.. ..*..*. | > 5e+07 ++ *. *. | > | | > 0 ++----------------------------------------------------------------+ > > vmstat.system.in > > 300000 ++-----------------------------------------------------------------+ > | O O O | > O O O O O | > 250000 ++ O O O O > | O | > | O O O O O O | > 200000 ++ O O | > | | > 150000 ++ | > | | > | | > 100000 ++ | > | .*... .*..*...*..*..*...* | > *..*...*..*. *.. .*... .*...*. | > 50000 ++------------------*------*---------------------------------------+ > > [*] bisect-good sample > [O] bisect-bad sample > > To reproduce: > > git clone > git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git > cd lkp-tests > bin/lkp install job.yaml # job file is attached in this email > bin/lkp run job.yaml I try to recreate this on one of my Intel machines (Xeon CPU E5-2650 v2 @ 2.60GHz) w/ 16 logical cpus. We haven't seen anything near a 20% performance degradation for hackbench when we were running our hackbench tests on 5/6 core arm machines as well as on a IVB-EP (2*10*2) Intel machine. So I cloned the repo: # git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg /lkp-tests.git lkp-tests and ran the hackbench example: root # lkp install $LKP_SRC/jobs/hackbench.yaml root # lkp split-job $LKP_SRC/jobs/hackbench.yaml root # lkp run ./hackbench-50%-threads-socket.yaml 2015-10-12 19:27:20 /usr/bin/hackbench -g 8 --threads -l 60000 Running in threaded mode with 8 groups using 40 file descriptors each (== 320 tasks) Each sender will pass 60000 messages of 100 bytes ... wait for background monitors: perf-profile uptime proc-vmstat proc-stat meminfo slabinfo interrupts softirqs diskstats cpuidle turbostat sched_debug root # lkp result hackbench /result/hackbench/50%-threads-socket-50/$MACHINE/ubuntu/defconfig/gcc-4.8/3.16.0-50-generic/0/ But I can't get any statistics out of it? root # lkp stat hackbench runs sum average stddev% case Thanks for your help in advance! -- Dietmar [...] -- 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/
