From: Mel Gorman <mgorman@techsingularity.net>
To: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org,
Matt Fleming <matt@codeblueprint.co.uk>
Subject: Re: [PATCH] sched: Only migrate tasks due to interrupts on an idle CPU if prev and target CPUs share cache
Date: Sat, 16 Dec 2017 18:28:08 +0000 [thread overview]
Message-ID: <20171216182808.gc63wdzpxqw5p732@techsingularity.net> (raw)
In-Reply-To: <1513370286.11185.136.camel@gmx.de>
On Fri, Dec 15, 2017 at 09:38:06PM +0100, Mike Galbraith wrote:
> On Fri, 2017-12-15 at 16:52 +0000, Mel Gorman wrote:
> >
> > It's a small improvement...
>
> From my log on corr.arch.suse.de (2x8 box)
>
> 4.15.0.g2db767d-default
> Throughput 2665.88 MB/sec 8 clients 8 procs max_latency=21.472 ms
> 4.15.0.g2db767d-default NO_WA_IDLE
> Throughput 3416.35 MB/sec 8 clients 8 procs max_latency=9.825 ms
>
> Not so small improvement. WA_IDLE ripped corr up pretty bad, turning
> it off restored 4.4 performance.
>
Sounds plausible. I expect it depends on the remote access latency as
well as whether the data gets prefetched fast enough.
--
Mel Gorman
SUSE Labs
prev parent reply other threads:[~2017-12-16 18:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-15 16:52 Mel Gorman
2017-12-15 20:38 ` Mike Galbraith
2017-12-16 18:28 ` Mel Gorman [this message]
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=20171216182808.gc63wdzpxqw5p732@techsingularity.net \
--to=mgorman@techsingularity.net \
--cc=efault@gmx.de \
--cc=linux-kernel@vger.kernel.org \
--cc=matt@codeblueprint.co.uk \
--cc=mingo@redhat.com \
--cc=peterz@infradead.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®