From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 14 Oct 2004 17:16:59 +1000 From: Nathan Scott 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> Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: piggin@cyberone.com.au, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@oss.sgi.com List-ID: 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, 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: aart@kvack.org