From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757553Ab1I2U6b (ORCPT ); Thu, 29 Sep 2011 16:58:31 -0400 Received: from minas.ics.muni.cz ([147.251.4.40]:49774 "EHLO minas.ics.muni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754171Ab1I2U6a (ORCPT ); Thu, 29 Sep 2011 16:58:30 -0400 Date: Thu, 29 Sep 2011 22:57:48 +0200 From: Lukas Hejtmanek To: "Jun'ichi Nomura" Cc: Mike Snitzer , Kiyoshi Ueda , agk@redhat.com, linux-kernel@vger.kernel.org Subject: Re: request baset device mapper in Linux Message-ID: <20110929205748.GX19004@ics.muni.cz> References: <20110721132627.GY7561@ics.muni.cz> <4E291F28.2040609@ct.jp.nec.com> <20110722081903.GB7561@ics.muni.cz> <4E2A7806.1060601@ce.jp.nec.com> <20110724221619.GM16487@ics.muni.cz> <4E367256.8020206@ct.jp.nec.com> <20110908132756.GT31717@ics.muni.cz> <20110916140839.GE7428@ics.muni.cz> <4E76D810.6010504@ce.jp.nec.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4E76D810.6010504@ce.jp.nec.com> X-echelon: NSA, CIA, CI5, MI5, FBI, KGB, BIS, Plutonium, Bin Laden, bomb User-Agent: Mutt/1.5.21 (2010-09-15) X-Muni-Spam-TestIP: 94.112.253.31 X-Muni-Envelope-From: xhejtman@anubis.ics.muni.cz X-Muni-Virus-Test: Clean X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-3.0 (minas.ics.muni.cz [147.251.4.35]); Thu, 29 Sep 2011 22:58:16 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 19, 2011 at 02:50:08PM +0900, Jun'ichi Nomura wrote: > 2.6.32.36 > no-multipath: 2.8 GB/s > multipath: 600 MB/s > multipath w/ patch: 2.8-2.9 GB/s > > 3.0.3 > no-multipath: ?? > multipath: 2.5 GB/s > multipath w/ patch: 2.5 GB/s(?) > > Have you tried 3.0.3 without multipath? yes, 3GB/s and only kwapd0 and kswapd1 is running, no kworker or ksoftirqd.. > > top looks like this: > > 63 root 20 0 0 0 0 S 38 0.0 0:16.65 kswapd1 > > 18 root 20 0 0 0 0 R 32 0.0 0:14.38 kworker/4:0 > > 19 root 20 0 0 0 0 R 30 0.0 0:20.88 ksoftirqd/4 > > 153 root 20 0 0 0 0 R 29 0.0 0:14.46 kworker/4:2 > > 62 root 20 0 0 0 0 S 22 0.0 0:09.44 kswapd0 > > dm-multipath itself does not use workqueue for normal I/Os. > So you might be hitting a different problem. -- Lukáš Hejtmánek