From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Richard Davies <richard@arachsys.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Minchan Kim <minchan.kim@gmail.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Christoph Lameter <cl@linux-foundation.org>,
Lee Schermerhorn <lee.schermerhorn@hp.com>,
Chris Webb <chris@arachsys.com>, Badari <pbadari@us.ibm.com>
Subject: Re: Over-eager swapping
Date: Mon, 23 Apr 2012 10:19:15 -0700 [thread overview]
Message-ID: <4F958F13.1000005@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120423092730.GB20543@alpha.arachsys.com>
On 04/23/2012 02:27 AM, Richard Davies wrote:
> # cat /proc/meminfo
> MemTotal: 65915384 kB
> MemFree: 271104 kB
> Buffers: 36274368 kB
Your "Buffers" are the only thing that really stands out here. We used
to see this kind of thing on ext3 a lot, but it's gotten much better
lately. From slabinfo, you can see all the buffer_heads:
buffer_head 8175114 8360937 104 39 1 : tunables 0 0
0 : slabdata 214383 214383 0
I _think_ this was a filesystems issue where the FS for some reason kept
the buffers locked down. The swapping just comes later as so much of
RAM is eaten up by buffers.
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Richard Davies <richard@arachsys.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Minchan Kim <minchan.kim@gmail.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Christoph Lameter <cl@linux-foundation.org>,
Lee Schermerhorn <lee.schermerhorn@hp.com>,
Chris Webb <chris@arachsys.com>, Badari <pbadari@us.ibm.com>
Subject: Re: Over-eager swapping
Date: Mon, 23 Apr 2012 10:19:15 -0700 [thread overview]
Message-ID: <4F958F13.1000005@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120423092730.GB20543@alpha.arachsys.com>
On 04/23/2012 02:27 AM, Richard Davies wrote:
> # cat /proc/meminfo
> MemTotal: 65915384 kB
> MemFree: 271104 kB
> Buffers: 36274368 kB
Your "Buffers" are the only thing that really stands out here. We used
to see this kind of thing on ext3 a lot, but it's gotten much better
lately. From slabinfo, you can see all the buffer_heads:
buffer_head 8175114 8360937 104 39 1 : tunables 0 0
0 : slabdata 214383 214383 0
I _think_ this was a filesystems issue where the FS for some reason kept
the buffers locked down. The swapping just comes later as so much of
RAM is eaten up by buffers.
next prev parent reply other threads:[~2012-04-23 17:19 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 9:27 Over-eager swapping 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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2010-08-02 12:47 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
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
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