Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933893AbYBWLao (ORCPT ); Sat, 23 Feb 2008 06:30:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752468AbYBWLag (ORCPT ); Sat, 23 Feb 2008 06:30:36 -0500 Received: from gwu.lbox.cz ([62.245.111.132]:56956 "EHLO gwu.lbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751563AbYBWLaf (ORCPT ); Sat, 23 Feb 2008 06:30:35 -0500 X-Greylist: delayed 616 seconds by postgrey-1.27 at vger.kernel.org; Sat, 23 Feb 2008 06:30:35 EST Date: Sat, 23 Feb 2008 12:20:12 +0100 (CET) From: Nikola Ciprich To: linux-kernel@vger.kernel.org Subject: arcmsr & areca-1660 - strange behaviour under heavy load Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Antivirus: on proxybox by Kaspersky antivirus, engine 5.5.10, data 533331 records(23-02-2008) X-Spam-Score: N/A (trusted relay) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1955 Lines: 48 Hi, I've found strange problem either in arcmsr driver, or maybe in areca-1660 card... When system on SAS discs RAID connected to areca-1660 card gets under heavy I/O load, it gets unusable after some time. I can 100% reproduce this, although it needs quite speciffic conditions: It can be reproduced on 2x quad core machine, RAM has to be limited to ~192MB to cause heavy paging. Only thing needed to cause the problem is to start loop doing kernel compilation using make -j 8 - this loads the system heavily, because of lack of memory. After few correct compile runs the system gets into state when all programs including the basic ones (ls, cp, ..) start crashing... dmesg (when it works) doesn't say anything strange... After reboot, the system is OK again. I have tested it on different motherboards, with different CPUs, RAMs(all were properly tested with memtest), with two different areca cards and different drives. I can't reproduce the problem on same hardware when using different RAID card (ie adaptec). All testing systems were properly cooled.. I have tried all available areca firmwares, two different distributions (oracle linux, and centos), and kernels ranging from distribution ones, to last GIT snapshot. Could somebody please give me some hints on how to hunt this problem? Areca support doesn't seem to be very interested in the problem :-( Thanks a lot in advance BR nik ------------------------------------- Nikola CIPRICH LinuxBox.cz, s.r.o. 28. rijna 168, 709 01 Ostrava tel.: +420 596 603 142 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: servis@linuxbox.cz ------------------------------------- -- 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/