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Message-Id: <20101012100207.4efbdab6.kamezawa.hiroyu@jp.fujitsu.com>
Date: Tue, 12 Oct 2010 10:02:07 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jack Steiner <steiner@....com>, yinghai@...nel.org, mingo@...e.hu,
linux-kernel@...r.kernel.org
Subject: Re: Problem: scaling of /proc/stat on large systems
On Mon, 11 Oct 2010 17:22:26 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 12 Oct 2010 09:09:07 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...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@....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.
>
ok, will do today.
-Kame
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