| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <561BFF62.20503@arm.com>
Date: Mon, 12 Oct 2015 19:43:46 +0100
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: kernel test robot <ying.huang@...el.com>,
Morten Rasmussen <Morten.Rasmussen@....com>
Cc: "lkp@...org" <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Mike Galbraith <efault@....de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Juri Lelli <Juri.Lelli@....com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [lkp] [sched/fair] 98d8fd8126: -20.8% hackbench.throughput
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 majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists