From: Christoph Lameter <cl@linux.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Rob Mueller <robm@fastmail.fm>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, Bron Gondwana <brong@fastmail.fm>,
linux-mm <linux-mm@kvack.org>
Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers
Date: Tue, 21 Sep 2010 09:14:13 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1009210911270.1271@router.home> (raw)
In-Reply-To: <20100921090407.GA11439@csn.ul.ie>
On Tue, 21 Sep 2010, Mel Gorman wrote:
> > However there's still another question, why is this problem happening at
> > all for us? I know almost nothing about NUMA, but from other posts, it
> > sounds like the problem is the memory allocations are all happening on
> > one node?
>
> Yes.
This could be a screwy hardware issue as pointed out before. Certain
controllers restrict the memory that I/O can be done to also (32 bit
controller only able to do I/O to lower 2G?, controller on a PCI bus that
is local only to a particular node) which would make balancing
the file cache difficult.
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next prev parent reply other threads:[~2010-09-21 14:14 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1284349152.15254.1394658481@webmail.messagingengine.com>
2010-09-16 10:01 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers KOSAKI Motohiro
2010-09-16 17:06 ` Christoph Lameter
2010-09-17 0:50 ` Robert Mueller
2010-09-17 6:01 ` Shaohua Li
2010-09-17 7:32 ` Robert Mueller
2010-09-17 13:56 ` Christoph Lameter
2010-09-17 14:09 ` Bron Gondwana
2010-09-17 14:22 ` Christoph Lameter
2010-09-17 23:01 ` Bron Gondwana
2010-09-20 9:34 ` Mel Gorman
2010-09-20 23:41 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers Rob Mueller
2010-09-21 9:04 ` Mel Gorman
2010-09-21 14:14 ` Christoph Lameter [this message]
2010-09-22 3:44 ` Rob Mueller
2010-09-27 2:01 ` KOSAKI Motohiro
2010-09-27 13:53 ` Christoph Lameter
2010-09-27 23:17 ` Robert Mueller
2010-09-28 12:35 ` Christoph Lameter
2010-09-28 12:42 ` Bron Gondwana
2010-09-28 12:49 ` Christoph Lameter
2010-09-30 7:05 ` Andi Kleen
2010-10-04 12:45 ` KOSAKI Motohiro
2010-10-04 13:07 ` Christoph Lameter
2010-10-05 5:32 ` KOSAKI Motohiro
2010-10-04 19:43 ` David Rientjes
2010-09-21 1:05 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers KAMEZAWA Hiroyuki
2010-09-27 2:04 ` KOSAKI Motohiro
2010-09-27 2:06 ` KAMEZAWA Hiroyuki
2010-09-23 11:44 ` Balbir Singh
2010-09-30 8:38 ` Bron Gondwana
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