From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@engr.sgi.com>
Cc: Andi Kleen <ak@suse.de>,
akpm@osdl.org, Christoph Hellwig <hch@infradead.org>,
linux-ia64@vger.kernel.org, steiner@sgi.com,
linux-kernel@vger.kernel.org, Wu Fengguang <wfg@mail.ustc.edu.cn>,
discuss@x86-64.org
Subject: Re: [discuss] Re: [PATCH 1/3] Zone reclaim V3: main patch
Date: Fri, 9 Dec 2005 00:40:58 +0100 [thread overview]
Message-ID: <20051208234058.GA11190@wotan.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.62.0512081531150.31342@schroedinger.engr.sgi.com>
On Thu, Dec 08, 2005 at 03:35:05PM -0800, Christoph Lameter wrote:
> On Fri, 9 Dec 2005, Andi Kleen wrote:
>
> > > My experience is that at 20 systems do not need zone reclaim yet.
> >
> > I really cannot confirm your experience here.
>
> Maybe the meaning of these numbers varies? I know that 10 is a local
> access but the assumption in include/linux/numa.h that 20 is a remote
> access is probably already a guess.
The spec seems to suggest it's roughly the NUMA factor scaled (so for 1.4
you would get 14). But I haven't actually seen a Opteron with correct
SLIT yet so I don't know what they use ...
> I know that our Altix machines seem to use 10 for a local and 20 for
> nonlocal but same box. The distances then increase from there.
Unless non local same box is 2 times as slow as the local I wouldn't
consider that correct. (I would expect the Altix to do better than that)
-Andi
next prev parent reply other threads:[~2005-12-08 23:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-08 20:37 [PATCH 1/3] Zone reclaim V3: main patch Christoph Lameter
2005-12-08 20:37 ` [PATCH 2/3] Zone reclaim V3: Remove debris from old zone reclaim Christoph Lameter
2005-12-08 20:37 ` [PATCH 3/3] Zone reclaim V3: Frequency of failed reclaim attempts Christoph Lameter
2005-12-08 20:52 ` Andi Kleen
2005-12-08 21:08 ` Christoph Lameter
2005-12-08 21:08 ` Christoph Lameter
2005-12-08 21:10 ` Andi Kleen
2005-12-08 21:08 ` [PATCH 1/3] Zone reclaim V3: main patch Andi Kleen
2005-12-08 21:23 ` Christoph Lameter
2005-12-08 22:51 ` Andi Kleen
2005-12-08 23:19 ` Christoph Lameter
2005-12-08 23:28 ` [discuss] " Andi Kleen
2005-12-08 23:35 ` Christoph Lameter
2005-12-08 23:40 ` Andi Kleen [this message]
2005-12-09 0:10 ` Christoph Lameter
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