From: Andrew Morton <akpm@linux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Jack Steiner <steiner@sgi.com>,
yinghai@kernel.org, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: Problem: scaling of /proc/stat on large systems
Date: Mon, 11 Oct 2010 17:22:26 -0700 [thread overview]
Message-ID: <20101011172226.6162476c.akpm@linux-foundation.org> (raw)
In-Reply-To: <20101012090907.5dd1cf57.kamezawa.hiroyu@jp.fujitsu.com>
On Tue, 12 Oct 2010 09:09:07 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> > >
> > > How about this ? This is an add-on patch.
> >
> > Nice!!
> >
> > The combination of the 2 patches solves the problem.
> > The timings are (4096p, 256 nodes, 4592 irqs):
> >
> > # time cat /proc/stat > /dev/null
> >
> > Baseline: 12.627 sec
> > Patch1 : 2.459 sec
> > Patch 1 + Patch 2: .561 sec
> >
> >
> > Acked-by: Jack Steiner <steiner@sgi.com>
> >
>
> Thank you for testing. I'll post again if necessary.
Yes please. This has been going on for two weeks so memories need
refreshing. Also we have no patch title and no changelog which
includes the testing results.
I could stitch all that together of course, but it's best that it all
be done afresh, I think.
next prev parent reply other threads:[~2010-10-12 0:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-29 12:22 Problem: scaling of /proc/stat on large systems Jack Steiner
2010-09-30 5:09 ` KAMEZAWA Hiroyuki
2010-10-04 14:34 ` Jack Steiner
2010-10-05 1:36 ` KAMEZAWA Hiroyuki
2010-10-05 8:19 ` KAMEZAWA Hiroyuki
2010-10-08 16:35 ` Jack Steiner
2010-10-12 0:09 ` KAMEZAWA Hiroyuki
2010-10-12 0:22 ` Andrew Morton [this message]
2010-10-12 1:02 ` KAMEZAWA Hiroyuki
2010-10-12 2:37 ` [PATCH 1/2] fix slowness of /proc/stat per-cpu IRQ sum calculation on large system by a new counter KAMEZAWA Hiroyuki
2010-10-12 2:39 ` [PATCH 2/2] improve footprint of kstat_irqs() for large system's /proc/stat KAMEZAWA Hiroyuki
2010-10-12 3:05 ` [PATCH 1/2] fix slowness of /proc/stat per-cpu IRQ sum calculation on large system by a new counter Yinghai Lu
2010-10-12 3:11 ` KAMEZAWA Hiroyuki
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