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From: Chris Webb <chris@arachsys.com>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
	Minchan Kim <minchan.kim@gmail.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	Andi Kleen <andi@firstfloor.org>,
	Christoph Lameter <cl@linux-foundation.org>
Subject: Re: Over-eager swapping
Date: Wed, 18 Aug 2010 16:58:25 +0100	[thread overview]
Message-ID: <20100818155825.GA2370@arachsys.com> (raw)
In-Reply-To: <1282147034.77481.33.camel@useless.localdomain>

Lee Schermerhorn <Lee.Schermerhorn@hp.com> writes:

> On Wed, 2010-08-18 at 23:21 +0800, Wu Fengguang wrote:
> > Andi, Christoph and Lee:
> > 
> > This looks like an "unbalanced NUMA memory usage leading to premature
> > swapping" problem.
> 
> What is the value of the vm.zone_reclaim_mode sysctl?  If it is !0, the
> system will go into zone reclaim before allocating off-node pages.
> However, it shouldn't "swap" in this case unless (zone_reclaim_mode & 4)
> != 0.  And even then, zone reclaim should only reclaim file pages, not
> anon.  In theory...

Hi. This is zero on all our machines:

# sysctl vm.zone_reclaim_mode
vm.zone_reclaim_mode = 0

Cheers,

Chris.

WARNING: multiple messages have this Message-ID (diff)
From: Chris Webb <chris@arachsys.com>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
	Minchan Kim <minchan.kim@gmail.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	Andi Kleen <andi@firstfloor.org>,
	Christoph Lameter <cl@linux-foundation.org>
Subject: Re: Over-eager swapping
Date: Wed, 18 Aug 2010 16:58:25 +0100	[thread overview]
Message-ID: <20100818155825.GA2370@arachsys.com> (raw)
In-Reply-To: <1282147034.77481.33.camel@useless.localdomain>

Lee Schermerhorn <Lee.Schermerhorn@hp.com> writes:

> On Wed, 2010-08-18 at 23:21 +0800, Wu Fengguang wrote:
> > Andi, Christoph and Lee:
> > 
> > This looks like an "unbalanced NUMA memory usage leading to premature
> > swapping" problem.
> 
> What is the value of the vm.zone_reclaim_mode sysctl?  If it is !0, the
> system will go into zone reclaim before allocating off-node pages.
> However, it shouldn't "swap" in this case unless (zone_reclaim_mode & 4)
> != 0.  And even then, zone reclaim should only reclaim file pages, not
> anon.  In theory...

Hi. This is zero on all our machines:

# sysctl vm.zone_reclaim_mode
vm.zone_reclaim_mode = 0

Cheers,

Chris.

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  reply	other threads:[~2010-08-18 16:00 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-02 12:47 Over-eager swapping Chris Webb
2010-08-02 12:47 ` Chris Webb
2010-08-02 23:55 ` Minchan Kim
2010-08-02 23:55   ` Minchan Kim
2010-08-03  3:31   ` Chris Webb
2010-08-03  3:31     ` Chris Webb
2010-08-03  4:09     ` Minchan Kim
2010-08-03  4:09       ` Minchan Kim
2010-08-03  4:28       ` Wu Fengguang
2010-08-03  4:28         ` Wu Fengguang
2010-08-03  4:47         ` Minchan Kim
2010-08-03  4:47           ` Minchan Kim
2010-08-03  6:39           ` Wu Fengguang
2010-08-03  6:39             ` Wu Fengguang
2010-08-03 21:49         ` Chris Webb
2010-08-03 21:49           ` Chris Webb
2010-08-04  2:21           ` Wu Fengguang
2010-08-04  2:21             ` Wu Fengguang
2010-08-04  3:10             ` Minchan Kim
2010-08-04  3:24               ` Wu Fengguang
2010-08-04  3:24                 ` Wu Fengguang
2010-08-04  9:58                 ` Chris Webb
2010-08-04  9:58                   ` Chris Webb
2010-08-04 11:49                   ` Wu Fengguang
2010-08-04 11:49                     ` Wu Fengguang
2010-08-04 12:04                     ` Chris Webb
2010-08-04 12:04                       ` Chris Webb
2010-08-18 14:38                       ` Wu Fengguang
2010-08-18 14:38                         ` Wu Fengguang
2010-08-18 14:46                         ` Chris Webb
2010-08-18 14:46                           ` Chris Webb
2010-08-18 15:21                           ` Wu Fengguang
2010-08-18 15:21                             ` Wu Fengguang
2010-08-18 15:57                             ` Christoph Lameter
2010-08-18 15:57                               ` Christoph Lameter
2010-08-18 16:20                               ` Wu Fengguang
2010-08-18 16:20                                 ` Wu Fengguang
2010-08-18 15:57                             ` Lee Schermerhorn
2010-08-18 15:57                               ` Lee Schermerhorn
2010-08-18 15:58                               ` Chris Webb [this message]
2010-08-18 15:58                                 ` Chris Webb
2010-08-18 16:13                                 ` Christoph Lameter
2010-08-18 16:13                                   ` Christoph Lameter
2010-08-18 16:32                                   ` Chris Webb
2010-08-18 16:32                                     ` Chris Webb
2010-08-19  5:16                                   ` Balbir Singh
2010-08-19  5:16                                     ` Balbir Singh
2010-08-19 10:20                                   ` Chris Webb
2010-08-19 10:20                                     ` Chris Webb
2010-08-19 19:03                                     ` Christoph Lameter
2010-08-19 19:03                                       ` Christoph Lameter
2010-08-18 16:13                                 ` Wu Fengguang
2010-08-18 16:13                                   ` Wu Fengguang
2010-08-18 16:31                                   ` Chris Webb
2010-08-18 16:31                                     ` Chris Webb
2010-08-19  5:13         ` Balbir Singh
2010-08-19  5:13           ` Balbir Singh
2010-08-18 16:45 ` Balbir Singh
2010-08-18 16:45   ` Balbir Singh
2010-08-19  9:25   ` Chris Webb
2010-08-19  9:25     ` Chris Webb
2010-08-19 15:13     ` Balbir Singh
2010-08-19 15:13       ` Balbir Singh
  -- strict thread matches above, loose matches on Subject: below --
2012-04-23  9:27 Richard Davies
2012-04-23  9:27 ` Richard Davies
2012-04-23 12:07 ` Zdenek Kaspar
2012-04-23 12:07   ` Zdenek Kaspar
2012-04-23 17:19 ` Dave Hansen
2012-04-23 17:19   ` Dave Hansen
2012-04-24  0:35 ` Minchan Kim
2012-04-24  0:35   ` Minchan Kim
2012-04-24 11:16 ` Peter Lieven
2012-04-24 11:16   ` Peter Lieven
2012-04-25 14:41 ` Rik van Riel
2012-04-25 14:41   ` Rik van Riel

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