From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760748AbZD1HtG (ORCPT ); Tue, 28 Apr 2009 03:49:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752760AbZD1Hs4 (ORCPT ); Tue, 28 Apr 2009 03:48:56 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:46132 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751363AbZD1Hsz (ORCPT ); Tue, 28 Apr 2009 03:48:55 -0400 Subject: Re: Swappiness vs. mmap() and interactive response From: Peter Zijlstra To: KOSAKI Motohiro Cc: Elladan , linux-kernel@vger.kernel.org, linux-mm , Rik van Riel In-Reply-To: <20090428143019.EBBF.A69D9226@jp.fujitsu.com> References: <20090428044426.GA5035@eskimo.com> <20090428143019.EBBF.A69D9226@jp.fujitsu.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Tue, 28 Apr 2009 09:48:39 +0200 Message-Id: <1240904919.7620.73.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2009-04-28 at 14:35 +0900, KOSAKI Motohiro wrote: > (cc to linux-mm and Rik) > > > > Hi, > > > > So, I just set up Ubuntu Jaunty (using Linux 2.6.28) on a quad core phenom box, > > and then I did the following (with XFS over LVM): > > > > mv /500gig/of/data/on/disk/one /disk/two > > > > This quickly caused the system to. grind.. to... a.... complete..... halt. > > Basically every UI operation, including the mouse in Xorg, started experiencing > > multiple second lag and delays. This made the system essentially unusable -- > > for example, just flipping to the window where the "mv" command was running > > took 10 seconds on more than one occasion. Basically a "click and get coffee" > > interface. > > I have some question and request. > > 1. please post your /proc/meminfo > 2. Do above copy make tons swap-out? IOW your disk read much faster than write? > 3. cache limitation of memcgroup solve this problem? > 4. Which disk have your /bin and /usr/bin? > FWIW I fundamentally object to 3 as being a solution. I still think the idea of read-ahead driven drop-behind is a good one, alas last time we brought that up people thought differently. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with ESMTP id 27D176B004D for ; Tue, 28 Apr 2009 03:48:06 -0400 (EDT) Subject: Re: Swappiness vs. mmap() and interactive response From: Peter Zijlstra In-Reply-To: <20090428143019.EBBF.A69D9226@jp.fujitsu.com> References: <20090428044426.GA5035@eskimo.com> <20090428143019.EBBF.A69D9226@jp.fujitsu.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Tue, 28 Apr 2009 09:48:39 +0200 Message-Id: <1240904919.7620.73.camel@twins> Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: Elladan , linux-kernel@vger.kernel.org, linux-mm , Rik van Riel List-ID: On Tue, 2009-04-28 at 14:35 +0900, KOSAKI Motohiro wrote: > (cc to linux-mm and Rik) > > > > Hi, > > > > So, I just set up Ubuntu Jaunty (using Linux 2.6.28) on a quad core phenom box, > > and then I did the following (with XFS over LVM): > > > > mv /500gig/of/data/on/disk/one /disk/two > > > > This quickly caused the system to. grind.. to... a.... complete..... halt. > > Basically every UI operation, including the mouse in Xorg, started experiencing > > multiple second lag and delays. This made the system essentially unusable -- > > for example, just flipping to the window where the "mv" command was running > > took 10 seconds on more than one occasion. Basically a "click and get coffee" > > interface. > > I have some question and request. > > 1. please post your /proc/meminfo > 2. Do above copy make tons swap-out? IOW your disk read much faster than write? > 3. cache limitation of memcgroup solve this problem? > 4. Which disk have your /bin and /usr/bin? > FWIW I fundamentally object to 3 as being a solution. I still think the idea of read-ahead driven drop-behind is a good one, alas last time we brought that up people thought differently. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org