From: "Rob Mueller" <robm@fastmail.fm>
To: David Rientjes <rientjes@google.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH resend^2] mm: increase RECLAIM_DISTANCE to 30
Date: Wed, 13 Apr 2011 10:26:50 +1000 [thread overview]
Message-ID: <90769A9DD8A14AE8A5A08BAC24B1245F@jem> (raw)
In-Reply-To: <alpine.DEB.2.00.1104121659510.10966@chino.kir.corp.google.com>
>> Recently, Robert Mueller reported zone_reclaim_mode doesn't work
>> properly on his new NUMA server (Dual Xeon E5520 + Intel S5520UR MB).
>> He is using Cyrus IMAPd and it's built on a very traditional
>> single-process model.
>>
>
> Let's add Robert to the cc to see if this is still an issue, it hasn't
> been re-reported in over six months.
We definitely still set this in /etc/sysctl.conf on every imap server
machine:
vm.zone_reclaim_mode = 0
I believe it still defaults to 1 otherwise. What I haven't tested is if
leaving it at 1 still causes problems. It definitely DID previously cause
big problems (I think that was around 2.6.34 or so).
http://blog.fastmail.fm/2010/09/15/default-zone_reclaim_mode-1-on-numa-kernel-is-bad-for-fileemailweb-servers/
I'll try changing it to 1 on a machine for 4 hours, see if it makes a
noticeable difference and report back.
Rob
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prev parent reply other threads:[~2011-04-13 0:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-11 8:19 KOSAKI Motohiro
2011-04-11 21:19 ` Andrew Morton
2011-04-12 0:59 ` KOSAKI Motohiro
2011-04-11 21:29 ` Dave Hansen
2011-04-12 1:01 ` KOSAKI Motohiro
2011-04-12 2:27 ` Dave Hansen
2011-04-12 7:25 ` KOSAKI Motohiro
2011-05-24 20:07 ` Andrew Morton
2011-05-24 20:24 ` David Rientjes
2011-05-24 20:37 ` Dave Hansen
2011-04-13 0:22 ` David Rientjes
2011-04-13 0:49 ` Dave Hansen
2011-04-13 0:56 ` David Rientjes
2011-04-13 0:16 ` David Rientjes
2011-04-13 0:26 ` Rob Mueller [this message]
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