From: Ralf Hildebrandt <Ralf.Hildebrandt@charite.de>
To: linux-kernel@vger.kernel.org
Subject: Re: Out of memory, but no OOM Killer? (2.6.9-ac11)
Date: Sat, 27 Nov 2004 01:33:53 +0100 [thread overview]
Message-ID: <20041127003353.GQ30987@charite.de> (raw)
In-Reply-To: <41A7C2CA.1030008@yahoo.com.au>
* Nick Piggin <nickpiggin@yahoo.com.au>:
> This could be the problem where fragmented memory causes atomic higher
> order allocations to fail, for which there is a fix in -mm, which should
> make its way into 2.6.11.
I see. rsync requested a big chunk of memory, but failed due to the
fragmentation of free memory? my "sar" output shows lots of free memory and
lots of unused swap:
03:55:01 kbmemfree kbmemused %memused kbbuffers kbcached kbswpfree kbswpused %swpused kbswpcad
04:55:01 2852 512048 99.45 2340 466792 2008084 0 0.00 0
05:05:02 2328 512572 99.55 500 467884 2008084 0 0.00 0
05:15:02 2008 512892 99.61 536 468664 2008084 0 0.00 0
05:25:01 31152 483748 93.95 1804 436728 2008084 0 0.00 0
05:35:01 4056 510844 99.21 5668 452856 2008084 0 0.00 0
05:45:01 129908 384992 74.77 836 305232 2008084 0 0.00 0
05:55:02 2376 512524 99.54 444 464200 2008084 0 0.00 0
06:05:02 1952 512948 99.62 608 465736 2008084 0 0.00 0
06:15:02 1576 513324 99.69 424 465580 2008084 0 0.00 0
for reference:
Nov 26 05:58:19 backup-in -- MARK --
Nov 26 06:02:04 backup-in kernel: rsync: page allocation failure. order:3, mode:0x20
> Also, the increased atomic memory reserves in current 2.6-bk should
> alleviate the problem.
2.4.27 doesn't seem to expose the problem either
> As a temporary workaround, you can increase /proc/sys/vm/min_free_kbytes
# cat /proc/sys/vm/min_free_kbytes
724
I increased that to 7240 now.
> BTW. what does `free` say when the allocation failures are happening?
see sar output above.
--
Ralf Hildebrandt (i.A. des IT-Zentrum) Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin Tel. +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin Fax. +49 (0)30-450 570-962
IT-Zentrum Standort CBF send no mail to spamtrap@charite.de
next prev parent reply other threads:[~2004-11-27 0:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-26 22:47 Out of memory, but no OOM Killer? (2.6.9-ac11) Ralf Hildebrandt
2004-11-26 23:56 ` Nick Piggin
2004-11-27 0:33 ` Ralf Hildebrandt [this message]
2004-11-27 1:10 ` Nick Piggin
2004-11-27 8:03 ` Ralf Hildebrandt
2004-11-28 17:29 ` Alan Cox
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