From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
William Lee Irwin III <wli@holomorphy.com>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Con Kolivas <kernel@kolivas.org>, Nick Piggin <npiggin@suse.de>,
Mike Galbraith <efault@gmx.de>,
Arjan van de Ven <arjan@infradead.org>,
Peter Williams <pwil3058@bigpond.net.au>,
Thomas Gleixner <tglx@linutronix.de>,
caglar@pardus.org.tr, Willy Tarreau <w@1wt.eu>,
Gene Heskett <gene.heskett@gmail.com>
Subject: Re: [patch] CFS scheduler, v3
Date: Tue, 24 Apr 2007 10:42:27 -0700 [thread overview]
Message-ID: <20070424174226.GE5475@linux-os.sc.intel.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0704241039110.8341@schroedinger.engr.sgi.com>
On Tue, Apr 24, 2007 at 10:39:48AM -0700, Christoph Lameter wrote:
> On Fri, 20 Apr 2007, Siddha, Suresh B wrote:
>
> > > Last I checked it was workload-dependent, but there were things that
> > > hammer it. I mostly know of the remote wakeup issue, but there could
> > > be other things besides wakeups that do it, too.
> >
> > remote wakeup was the main issue and the 0.5% improvement was seen
> > on a two node platform. Aligning it reduces the number of remote
> > cachelines that needs to be touched as part of this wakeup.
>
> .5% is usually in the noise ratio. Are you consistently seeing an
> improvement or is that sporadic?
No. This is consistent. I am waiting for the perf data on a much much bigger
NUMA box.
Anyhow, this is a straight forward optimization and needs to be done. Do you
have any specific concerns?
thanks,
suresh
next prev parent reply other threads:[~2007-04-24 17:44 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-18 17:50 [patch] CFS scheduler, v3 Ingo Molnar
2007-04-18 21:26 ` William Lee Irwin III
2007-04-18 21:33 ` Ingo Molnar
2007-04-20 19:24 ` Christoph Lameter
2007-04-20 19:26 ` Siddha, Suresh B
2007-04-20 19:29 ` William Lee Irwin III
2007-04-20 19:33 ` Christoph Lameter
2007-04-20 19:38 ` William Lee Irwin III
2007-04-20 19:44 ` Christoph Lameter
2007-04-20 20:03 ` William Lee Irwin III
2007-04-20 20:11 ` Siddha, Suresh B
2007-04-24 17:39 ` Christoph Lameter
2007-04-24 17:42 ` Siddha, Suresh B [this message]
2007-04-24 17:47 ` Christoph Lameter
2007-04-24 17:50 ` Siddha, Suresh B
2007-04-24 17:55 ` Christoph Lameter
2007-04-24 18:06 ` Siddha, Suresh B
2007-04-20 0:10 ` Peter Williams
2007-04-20 4:48 ` Willy Tarreau
2007-04-20 6:02 ` Peter Williams
2007-04-20 6:21 ` Peter Williams
2007-04-20 7:26 ` Willy Tarreau
2007-04-20 6:46 ` Ingo Molnar
2007-04-20 7:32 ` Peter Williams
2007-04-20 12:28 ` Peter Williams
2007-04-21 8:07 ` Peter Williams
2007-04-20 13:15 ` William Lee Irwin III
2007-04-21 0:23 ` Peter Williams
2007-04-21 5:07 ` William Lee Irwin III
2007-04-21 5:38 ` Peter Williams
2007-04-21 7:32 ` Peter Williams
2007-04-21 7:54 ` Ingo Molnar
2007-04-21 8:33 ` William Lee Irwin III
2007-04-21 8:57 ` Ingo Molnar
2007-04-21 16:23 ` William Lee Irwin III
2007-04-21 10:37 ` Peter Williams
2007-04-21 12:21 ` Peter Williams
2007-04-20 14:21 ` Peter Williams
2007-04-20 14:33 ` Ingo Molnar
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=20070424174226.GE5475@linux-os.sc.intel.com \
--to=suresh.b.siddha@intel.com \
--cc=akpm@linux-foundation.org \
--cc=arjan@infradead.org \
--cc=caglar@pardus.org.tr \
--cc=clameter@sgi.com \
--cc=efault@gmx.de \
--cc=gene.heskett@gmail.com \
--cc=kernel@kolivas.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=npiggin@suse.de \
--cc=pwil3058@bigpond.net.au \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=w@1wt.eu \
--cc=wli@holomorphy.com \
/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.