From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755363Ab0IPOdJ (ORCPT ); Thu, 16 Sep 2010 10:33:09 -0400 Received: from dtp.xs4all.nl ([80.101.171.8]:30077 "HELO abra2.bitwizard.nl" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1754981Ab0IPOdH (ORCPT ); Thu, 16 Sep 2010 10:33:07 -0400 Date: Thu, 16 Sep 2010 16:33:04 +0200 From: Rogier Wolff To: linux-kernel@vger.kernel.org Subject: Sudden "hangs".... Message-ID: <20100916143304.GA14874@bitwizard.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Organization: BitWizard.nl User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, It seems my home workstation hangs on a "mkdir" once every morning for about half a minute. It'll freeze whatever I'm doing and continue happily 30 seconds later, but I can't figure out what's going on because it's frozen... My server did it just now and I was able to grab some more debugging info..... obelix:~> time mkdir /recover3/testdir 0.000u 0.004s 2:11.83 0.0% 0+0k 0+0io 5pf+0w obelix:~> Over two minutes to make a directory! (I have the impression that the wait is for something to finish, so if I had started the mkdir a minute earlier, it would've taken a minute longer). The process: 28649 root 20 0 0 0 0 D 6.3 0.0 0:11.69 flush-9:0 was in "top", and as shown here in "disk wait" mode. While this is going on, "vmstat 1" shows: procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 1 5368 12764 324804 1616932 0 0 464 0 244 477 0 2 0 98 0 1 5368 12764 324556 1617168 0 0 448 0 255 474 0 1 0 99 0 1 5368 12764 324952 1616832 0 0 472 0 257 487 0 1 0 99 ... about 400 kbytes of IO per second. This is similar to the single-disk machine at home. The server runs: Linux version 2.6.34 (wolff@abra2) (gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #5 SMP Tue Jun 1 14:44:01 CEST 2010 at home I run: Linux version 2.6.28-19-generic (buildd@palmer) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #61-Ubuntu SMP Wed May 26 23:35:15 UTC 2010 Does anybody know what's going on? Roger. -- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 ** ** Delftechpark 26 2628 XH Delft, The Netherlands. KVK: 27239233 ** *-- BitWizard writes Linux device drivers for any device you may have! --* Q: It doesn't work. A: Look buddy, doesn't work is an ambiguous statement. Does it sit on the couch all day? Is it unemployed? Please be specific! Define 'it' and what it isn't doing. --------- Adapted from lxrbot FAQ