linux-kernel - Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers

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Date:	Tue, 21 Sep 2010 10:05:22 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	robm@...tmail.fm, linux-kernel@...r.kernel.org,
	"Bron Gondwana" <brong@...tmail.fm>, linux-mm <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad for
 file/email/web servers

On Thu, 16 Sep 2010 19:01:32 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...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 ?

Thanks,
-Kame

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