Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262435AbUK0AiZ (ORCPT ); Fri, 26 Nov 2004 19:38:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262415AbUK0Aeh (ORCPT ); Fri, 26 Nov 2004 19:34:37 -0500 Received: from mail.charite.de ([160.45.207.131]:10641 "EHLO mail.charite.de") by vger.kernel.org with ESMTP id S263076AbUK0Ad6 (ORCPT ); Fri, 26 Nov 2004 19:33:58 -0500 Date: Sat, 27 Nov 2004 01:33:53 +0100 From: Ralf Hildebrandt To: linux-kernel@vger.kernel.org Subject: Re: Out of memory, but no OOM Killer? (2.6.9-ac11) Message-ID: <20041127003353.GQ30987@charite.de> Mail-Followup-To: linux-kernel@vger.kernel.org References: <20041126224722.GK30987@charite.de> <41A7C2CA.1030008@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <41A7C2CA.1030008@yahoo.com.au> User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2396 Lines: 51 * Nick Piggin : > 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 - Universit?tsmedizin 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/