From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161778AbXD1I7X (ORCPT ); Sat, 28 Apr 2007 04:59:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161787AbXD1I7X (ORCPT ); Sat, 28 Apr 2007 04:59:23 -0400 Received: from smtp1.linux-foundation.org ([65.172.181.25]:50416 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161778AbXD1I7U (ORCPT ); Sat, 28 Apr 2007 04:59:20 -0400 Date: Sat, 28 Apr 2007 01:59:12 -0700 From: Andrew Morton To: Matthias Andree Cc: Linus Torvalds , Mike Galbraith , LKML , Jens Axboe Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS is under heavy write load (massive starvation) Message-Id: <20070428015912.6108dbd5.akpm@linux-foundation.org> In-Reply-To: <20070428085148.GC31196@merlin.emma.line.org> References: <1177660767.6567.41.camel@Homer.simpson.net> <20070427113117.98c4f88b.akpm@linux-foundation.org> <20070428085148.GC31196@merlin.emma.line.org> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 28 Apr 2007 10:51:48 +0200 Matthias Andree wrote: > On Fri, 27 Apr 2007, Andrew Morton wrote: > > > But none of this explains a 20-minute hang, unless a *lot* of fsyncs are > > being performed, perhaps. > > Another thing that is rather unpleasant (haven't yet tried fiddling with > the dirty limits) is UDF to DVD-RAM - try rsyncing /home to a DVD-RAM, > that's going to leave you with tons of dirty buffers that clear slowly > -- "watch -n 1 grep -i dirty /proc/meminfo" is boring, but elucidating... > yes, a few people are attacking that from various angles at present. It's tricky - writeback has to juggle a lot of balls. We'll get there.