Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269946AbUJNIBm (ORCPT ); Thu, 14 Oct 2004 04:01:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269994AbUJNIBm (ORCPT ); Thu, 14 Oct 2004 04:01:42 -0400 Received: from smtp209.mail.sc5.yahoo.com ([216.136.130.117]:64607 "HELO smtp209.mail.sc5.yahoo.com") by vger.kernel.org with SMTP id S269946AbUJNIBk (ORCPT ); Thu, 14 Oct 2004 04:01:40 -0400 Message-ID: <416E2B6F.5040803@yahoo.com.au> Date: Thu, 14 Oct 2004 17:31:59 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040820 Debian/1.7.2-4 X-Accept-Language: en MIME-Version: 1.0 To: Nathan Scott CC: Andrew Morton , piggin@cyberone.com.au, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@oss.sgi.com Subject: Re: Page cache write performance issue References: <20041013054452.GB1618@frodo> <20041012231945.2aff9a00.akpm@osdl.org> <20041013063955.GA2079@frodo> <20041013000206.680132ad.akpm@osdl.org> <20041013172352.B4917536@wobbly.melbourne.sgi.com> <416CE423.3000607@cyberone.com.au> <20041013013941.49693816.akpm@osdl.org> <20041014005300.GA716@frodo> <20041013202041.2e7066af.akpm@osdl.org> <20041014071659.GB1768@frodo> In-Reply-To: <20041014071659.GB1768@frodo> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1189 Lines: 32 Nathan Scott wrote: > On Wed, Oct 13, 2004 at 08:20:41PM -0700, Andrew Morton wrote: > >>Nathan Scott wrote: >> >>> I just tried switching CONFIG_HIGHMEM off, and so running the >>> machine with 512MB; then adjusted the test to write 256M into >>> the page cache, again in 1K sequential chunks. A similar mis- >>> behaviour happens, though the numbers are slightly better (up >>> from ~4 to ~6.5MB/sec). Both ext2 and xfs see this. When I >>> drop the file size down to 128M with this kernel, I see good >>> results again (as we'd expect). >> >>No such problem here, with >> >> dd if=/dev/zero of=x bs=1k count=128k >> >>on a 256MB machine. xfs and ext2. > > > Yup, rebooted with mem=128M and on my box, & that crawls. > Maybe its just this old hunk 'o junk, I suppose; odd that > 2.6.8 was OK with this though. > Just out of interest, can you get profiles and a few lines of vmstat 1 from 2.6.8 and 2.6.9-rc, please? - 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/