From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423501AbXD3SF5 (ORCPT ); Mon, 30 Apr 2007 14:05:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423480AbXD3SFz (ORCPT ); Mon, 30 Apr 2007 14:05:55 -0400 Received: from smtp1.linux-foundation.org ([65.172.181.25]:52761 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423512AbXD3SFO (ORCPT ); Mon, 30 Apr 2007 14:05:14 -0400 Date: Mon, 30 Apr 2007 11:05:10 -0700 From: Andrew Morton To: Jiri Slaby Cc: Linux Kernel Mailing List Subject: Re: 2.6.21-mm1: many processes end up in D state Message-Id: <20070430110510.1f559d34.akpm@linux-foundation.org> In-Reply-To: <46360DA7.6040003@gmail.com> References: <46360DA7.6040003@gmail.com> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.6; i686-pc-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 Mon, 30 Apr 2007 17:39:19 +0200 Jiri Slaby wrote: > Hi, > > I have a problem with higher disk loads (e.g. running git-log or yum update). > Many processes end up in D state and system is unusable -- I'm not able to run > anything but smooth mouse moving when this happens. > > If I wait for a 20-30sec it becomes usable. This happens in 2.6.21-rc7-mm2 and > also in 2007-04-28-05-06 broken-out snapshot. I think 2.6.21-rc6-mm1 worked > fine, but I'm uncertain. If it is important, let me know to re-test. > It is important, but I doubt if retesting 2.6.21-rc6-mm1 will clarify things a lot. Could you try switching to a different IO scheduler please? Anticipatory would suit. Please keep a close eye on mainline, too. Wait for it to appear there :(