Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269989AbUJNHUj (ORCPT ); Thu, 14 Oct 2004 03:20:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269988AbUJNHUh (ORCPT ); Thu, 14 Oct 2004 03:20:37 -0400 Received: from omx3-ext.sgi.com ([192.48.171.20]:52408 "EHLO omx3.sgi.com") by vger.kernel.org with ESMTP id S269991AbUJNHTG (ORCPT ); Thu, 14 Oct 2004 03:19:06 -0400 Date: Thu, 14 Oct 2004 17:16:59 +1000 From: Nathan Scott To: Andrew Morton Cc: 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 Message-ID: <20041014071659.GB1768@frodo> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041013202041.2e7066af.akpm@osdl.org> User-Agent: Mutt/1.5.3i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1323 Lines: 38 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. > Can you exhibit this one more than one machine? I haven't got a second ia32 box atm - setting one up soon, will let you know how it goes. > Silly question: what does `grep sync' /etc/fstab say over there? ;) Same thing it said on 2.6.8. :) Nada. cheers. -- Nathan - 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/