From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: kosaki.motohiro@jp.fujitsu.com, robm@fastmail.fm,
linux-kernel@vger.kernel.org, Bron Gondwana <brong@fastmail.fm>,
linux-mm <linux-mm@kvack.org>,
Christoph Lameter <cl@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers
Date: Mon, 27 Sep 2010 11:04:54 +0900 (JST) [thread overview]
Message-ID: <20100927110417.6B34.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <20100921100522.be252b3d.kamezawa.hiroyu@jp.fujitsu.com>
> On Thu, 16 Sep 2010 19:01:32 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
>
> > Yes, sadly intel motherboard turn on zone_reclaim_mode by default. and
> > current zone_reclaim_mode doesn't fit file/web server usecase ;-)
> >
> > So, I've created new proof concept patch. This doesn't disable zone_reclaim
> > at all. Instead, distinguish for file cache and for anon allocation and
> > only file cache doesn't use zone-reclaim.
> >
> > That said, high-end hpc user often turn on cpuset.memory_spread_page and
> > they avoid this issue. But, why don't we consider avoid it by default?
> >
> >
> > Rob, I wonder if following patch help you. Could you please try it?
> >
> >
> > Subject: [RFC] vmscan: file cache doesn't use zone_reclaim by default
> >
>
> Hm, can't we use migration of file caches rather than pageout in
> zone_reclaim_mode ? Doent' it fix anything ?
Doesn't.
Two problem. 1) Migration makes copy. then it's slower than zone_reclaim=0
2) Migration is only effective if target node has much free pages. but it
is not generic assumption.
For this case, zone_reclaim_mode=0 is best. my patch works as second best.
your one works as third.
If you have more concern, please let us know it.
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next prev parent reply other threads:[~2010-09-27 2:04 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 ` 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
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 [this message]
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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