From: Bill Irwin <bill.irwin@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>,
Christoph Lameter <clameter@engr.sgi.com>,
Mel Gorman <mel@skynet.ie>,
npiggin@suse.de, mingo@elte.hu, jschopp@austin.ibm.com,
arjan@infradead.org, torvalds@linux-foundation.org,
mbligh@mbligh.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related patches
Date: Fri, 2 Mar 2007 12:59:33 -0800 [thread overview]
Message-ID: <20070302205933.GI10643@holomorphy.com> (raw)
In-Reply-To: <20070302100619.cec06d6a.akpm@linux-foundation.org>
On Fri, 02 Mar 2007 12:43:42 -0500 Rik van Riel <riel@redhat.com> wrote:
>> I can't share all the details, since a lot of the problems are customer
>> workloads.
>> One particular case is a 32GB system with a database that takes most
>> of memory. The amount of actually freeable page cache memory is in
>> the hundreds of MB.
On Fri, Mar 02, 2007 at 10:06:19AM -0800, Andrew Morton wrote:
> Where's the rest of the memory? tmpfs? mlocked? hugetlb?
I know of one sounding similar to this where unreclaimable pages are
pinned by refcounts held by bio's spread across about 850 spindles.
It's mostly read traffic. Several different tunables could be used
to work around it, nr_requests in particular, but also clamping down
on dirty limits to preposterously low levels and setting preposterously
large values of min_free_kbytes. Their kernel is, of course,
substantially downrev (2.6.9-based IIRC), so douse things heavily with
grains of salt.
-- wli
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next prev parent reply other threads:[~2007-03-02 20:59 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-01 10:12 The performance and behaviour of the anti-fragmentation related patches Mel Gorman
2007-03-02 0:09 ` Andrew Morton
2007-03-02 0:44 ` Linus Torvalds
2007-03-02 1:52 ` Balbir Singh
2007-03-02 3:44 ` Linus Torvalds
2007-03-02 3:59 ` Andrew Morton
2007-03-02 5:11 ` Linus Torvalds
2007-03-02 5:50 ` KAMEZAWA Hiroyuki
2007-03-02 6:15 ` Paul Mundt
2007-03-02 17:01 ` Mel Gorman
2007-03-02 16:20 ` Mark Gross
2007-03-02 17:07 ` Andrew Morton
2007-03-02 17:35 ` Mark Gross
2007-03-02 18:02 ` Andrew Morton
2007-03-02 19:02 ` Mark Gross
2007-03-02 17:16 ` Linus Torvalds
2007-03-02 18:45 ` Mark Gross
2007-03-02 19:03 ` Linus Torvalds
2007-03-02 23:58 ` Martin J. Bligh
2007-03-02 4:18 ` Balbir Singh
2007-03-02 5:13 ` Jeremy Fitzhardinge
2007-03-06 4:16 ` Paul Mackerras
2007-03-02 16:58 ` Mel Gorman
2007-03-02 17:05 ` Joel Schopp
2007-03-05 3:21 ` Nick Piggin
2007-03-05 15:20 ` Joel Schopp
2007-03-05 16:01 ` Nick Piggin
2007-03-05 16:45 ` Joel Schopp
2007-05-03 8:49 ` Andy Whitcroft
2007-03-02 1:39 ` Balbir Singh
2007-03-02 2:34 ` KAMEZAWA Hiroyuki
2007-03-02 3:05 ` Christoph Lameter
2007-03-02 3:57 ` Nick Piggin
2007-03-02 4:06 ` Christoph Lameter
2007-03-02 4:21 ` Nick Piggin
2007-03-02 4:31 ` Christoph Lameter
2007-03-02 5:06 ` Nick Piggin
2007-03-02 5:40 ` Christoph Lameter
2007-03-02 5:49 ` Nick Piggin
2007-03-02 5:53 ` Christoph Lameter
2007-03-02 6:08 ` Nick Piggin
2007-03-02 6:19 ` Christoph Lameter
2007-03-02 6:29 ` Nick Piggin
2007-03-02 6:51 ` Christoph Lameter
2007-03-02 7:03 ` Andrew Morton
2007-03-02 7:19 ` Nick Piggin
2007-03-02 7:44 ` Christoph Lameter
2007-03-02 8:12 ` Nick Piggin
2007-03-02 8:21 ` Christoph Lameter
2007-03-02 8:38 ` Nick Piggin
2007-03-02 17:09 ` Christoph Lameter
2007-03-04 1:26 ` Rik van Riel
2007-03-04 1:51 ` Andrew Morton
2007-03-04 1:58 ` Rik van Riel
2007-03-02 5:50 ` Christoph Lameter
2007-03-02 4:29 ` Andrew Morton
2007-03-02 4:33 ` Christoph Lameter
2007-03-02 4:58 ` Andrew Morton
2007-03-02 4:20 ` Paul Mundt
2007-03-02 13:50 ` Arjan van de Ven
2007-03-02 15:29 ` Rik van Riel
2007-03-02 16:58 ` Andrew Morton
2007-03-02 17:09 ` Mel Gorman
2007-03-02 17:23 ` Christoph Lameter
2007-03-02 17:35 ` Andrew Morton
2007-03-02 17:43 ` Rik van Riel
2007-03-02 18:06 ` Andrew Morton
2007-03-02 18:15 ` Christoph Lameter
2007-03-02 18:23 ` Andrew Morton
2007-03-02 18:23 ` Rik van Riel
2007-03-02 19:31 ` Christoph Lameter
2007-03-02 19:40 ` Rik van Riel
2007-03-02 21:12 ` Bill Irwin
2007-03-02 21:19 ` Rik van Riel
2007-03-02 21:52 ` Andrew Morton
2007-03-02 22:03 ` Rik van Riel
2007-03-02 22:22 ` Andrew Morton
2007-03-02 22:34 ` Rik van Riel
2007-03-02 22:51 ` Martin Bligh
2007-03-02 22:54 ` Rik van Riel
2007-03-02 23:28 ` Martin J. Bligh
2007-03-03 0:24 ` Andrew Morton
2007-03-02 22:52 ` Chuck Ebbert
2007-03-02 22:59 ` Andrew Morton
2007-03-02 23:20 ` Rik van Riel
2007-03-03 1:40 ` William Lee Irwin III
2007-03-03 1:58 ` Andrew Morton
2007-03-03 3:55 ` William Lee Irwin III
2007-03-03 0:33 ` William Lee Irwin III
2007-03-03 0:54 ` Andrew Morton
2007-03-03 3:15 ` Christoph Lameter
2007-03-03 4:19 ` William Lee Irwin III
2007-03-03 17:16 ` Martin J. Bligh
2007-03-03 17:50 ` Christoph Lameter
2007-03-02 20:59 ` Bill Irwin [this message]
2007-03-02 1:52 ` Bill Irwin
2007-03-02 10:38 ` Mel Gorman
2007-03-02 16:31 ` Joel Schopp
2007-03-02 21:37 ` Bill Irwin
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