Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751993AbZJPX2p (ORCPT ); Fri, 16 Oct 2009 19:28:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751534AbZJPX2p (ORCPT ); Fri, 16 Oct 2009 19:28:45 -0400 Received: from lucidpixels.com ([75.144.35.66]:44601 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751131AbZJPX2o (ORCPT ); Fri, 16 Oct 2009 19:28:44 -0400 Date: Fri, 16 Oct 2009 19:28:28 -0400 (EDT) From: Justin Piszcz To: adam radford cc: linux-kernel@vger.kernel.org Subject: Re: 3ware 9650SE-4PML RAID-1 Question: One reader process starves I/O to the rest of the system? In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1926 Lines: 37 On Fri, 16 Oct 2009, adam radford wrote: > Justin, > > Can you try turning down the queue depth of the disk that is getting > written to to see if that resolves your responsiveness issue? > > I.E.: echo "16" > /sys/block/sdX/device/queue_depth > > (replace X with disk letter of device from /raid6 mountpoint). > > FYI: It's probably better to send questions like this to linux-scsi rather > than linux-kernel. > > -Adam > Hi, Will do in the future for related queries, I set it to 16, its almost usable, I set it to 8-- both are a bit slow during a dd read but at least it does not starve processes anymore to the point of failure, e.g.: Oct 16 18:17:18 p34 amavis[12685]: (12685-10) (!)SA TIMED OUT, backtrace: at /usr/share/perl5/Mail/SpamAssassin/BayesStore/DBM.pm line 1855\n\teval {...} called at /usr/share/perl5/Mail/SpamAssassin/BayesStore/DBM.pm line 1855\n\tMail::SpamAssassin::BayesStore::DBM::tok_unpack('Mail::SpamAssassin::BayesStore::DBM=HASH(0x4bf2400)', '\\x{0}\\x{97}\\x{0}\\x{0}\\x{0}\\x{e2}\\x{3}\\x{0}\\x{0}k\\x{af}\\x{d8}J') called at /usr/share/perl5/Mail/SpamAssassin/BayesStore/DBM.pm line 865\n\tMail::SpamAssassin::BayesStore::DBM::tok_get_all('Mail::SpamAssassin::BayesStore::DBM=HASH(0x4bf2400)', '\\x{e5}a\\x{96}\\x{ce} ', '\\x{b3}]\\x{5}\\x{13}\\x{dd}', 'd\\x{b7}\\x{88}\\x{f2}%', '\\x{da}\\x{1}\\x{d4}/T', '\\x{fe}\\x{18}\\x{c6}\\x{d0}_', 'J\\x{9}\\x{9b}\\x{9a} ', 'l\\x{ce}p\\x{92}Y', '\\x{b8}\\x{8e}\\x{cc}z\\x{b3}', ...) called at /usr/share/perl5/Mail/SpamAssassin/Bayes.pm line 1185\n\tMail::SpamAssassin::Bayes::scan('Mail::SpamAssassin::Bayes=HASH(0x214b4e0)', 'Mail::SpamAssassin::PerMsgS t[...] Thank you! Justin. -- 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/