From: Valentin Schneider <valentin.schneider@arm.com>
To: lkp@lists.01.org
Subject: Re: [sched/fair] 38ac256d1c: stress-ng.vm-segv.ops_per_sec -13.8% regression
Date: Thu, 22 Apr 2021 21:42:31 +0100 [thread overview]
Message-ID: <87mttqt5jc.mognet@arm.com> (raw)
In-Reply-To: <87wnsutzi9.mognet@arm.com>
[-- Attachment #1: Type: text/plain, Size: 506 bytes --]
On 22/04/21 10:55, Valentin Schneider wrote:
> I'll go find myself some other x86 box and dig into it;
> I'd rather not leave this hanging for too long.
So I found myself a dual-socket Xeon Gold 5120 @ 2.20GHz (64 CPUs) and
*there* I get a somewhat consistent ~-6% regression. As I'm suspecting
cacheline shenanigans, I also ran that with Peter's recent
kthread_is_per_cpu() change, and that brings it down to ~-3%
I'll leave it at here for today, but at least that's something I can work
with.
WARNING: multiple messages have this Message-ID (diff)
From: Valentin Schneider <valentin.schneider@arm.com>
To: Oliver Sang <oliver.sang@intel.com>
Cc: 0day robot <lkp@intel.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
LKML <linux-kernel@vger.kernel.org>,
lkp@lists.01.org, ying.huang@intel.com, feng.tang@intel.com,
zhengjun.xing@intel.com,
Lingutla Chandrasekhar <clingutla@codeaurora.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Qais Yousef <qais.yousef@arm.com>,
Quentin Perret <qperret@google.com>,
Pavan Kondeti <pkondeti@codeaurora.org>,
Rik van Riel <riel@surriel.com>,
aubrey.li@linux.intel.com, yu.c.chen@intel.com
Subject: Re: [sched/fair] 38ac256d1c: stress-ng.vm-segv.ops_per_sec -13.8% regression
Date: Thu, 22 Apr 2021 21:42:31 +0100 [thread overview]
Message-ID: <87mttqt5jc.mognet@arm.com> (raw)
In-Reply-To: <87wnsutzi9.mognet@arm.com>
On 22/04/21 10:55, Valentin Schneider wrote:
> I'll go find myself some other x86 box and dig into it;
> I'd rather not leave this hanging for too long.
So I found myself a dual-socket Xeon Gold 5120 @ 2.20GHz (64 CPUs) and
*there* I get a somewhat consistent ~-6% regression. As I'm suspecting
cacheline shenanigans, I also ran that with Peter's recent
kthread_is_per_cpu() change, and that brings it down to ~-3%
I'll leave it at here for today, but at least that's something I can work
with.
next prev parent reply other threads:[~2021-04-22 20:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 22:06 [PATCH v5 0/3] sched/fair: load-balance vs capacity margins Valentin Schneider
2021-04-07 22:06 ` [PATCH v5 1/3] sched/fair: Ignore percpu threads for imbalance pulls Valentin Schneider
2021-04-09 11:24 ` [tip: sched/core] " tip-bot2 for Lingutla Chandrasekhar
2021-04-09 12:05 ` tip-bot2 for Lingutla Chandrasekhar
2021-04-09 16:14 ` tip-bot2 for Lingutla Chandrasekhar
2021-04-14 5:21 ` [sched/fair] 38ac256d1c: stress-ng.vm-segv.ops_per_sec -13.8% regression kernel test robot
2021-04-14 5:21 ` kernel test robot
2021-04-14 17:17 ` Valentin Schneider
2021-04-14 17:17 ` Valentin Schneider
2021-04-21 3:20 ` Oliver Sang
2021-04-21 3:20 ` Oliver Sang
2021-04-21 10:27 ` Valentin Schneider
2021-04-21 10:27 ` Valentin Schneider
2021-04-21 12:03 ` Peter Zijlstra
2021-04-21 12:03 ` Peter Zijlstra
2021-04-22 7:47 ` Oliver Sang
2021-04-22 7:47 ` Oliver Sang
2021-04-22 9:55 ` Valentin Schneider
2021-04-22 9:55 ` Valentin Schneider
2021-04-22 20:42 ` Valentin Schneider [this message]
2021-04-22 20:42 ` Valentin Schneider
2021-04-28 22:00 ` Valentin Schneider
2021-04-28 22:00 ` Valentin Schneider
2021-05-06 16:11 ` Valentin Schneider
2021-05-06 16:11 ` Valentin Schneider
2021-04-07 22:06 ` [PATCH v5 2/3] sched/fair: Clean up active balance nr_balance_failed trickery Valentin Schneider
2021-04-09 11:24 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2021-04-09 12:05 ` tip-bot2 for Valentin Schneider
2021-04-09 16:14 ` tip-bot2 for Valentin Schneider
2021-04-07 22:06 ` [PATCH v5 3/3] sched/fair: Introduce a CPU capacity comparison helper Valentin Schneider
2021-04-09 11:24 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2021-04-09 12:05 ` tip-bot2 for Valentin Schneider
2021-04-09 16:14 ` tip-bot2 for Valentin Schneider
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87mttqt5jc.mognet@arm.com \
--to=valentin.schneider@arm.com \
--cc=lkp@lists.01.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.