Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965231AbXAJXMf (ORCPT ); Wed, 10 Jan 2007 18:12:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965242AbXAJXMf (ORCPT ); Wed, 10 Jan 2007 18:12:35 -0500 Received: from omx1-ext.sgi.com ([192.48.179.11]:53647 "EHLO omx1.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965231AbXAJXMe (ORCPT ); Wed, 10 Jan 2007 18:12:34 -0500 Date: Wed, 10 Jan 2007 15:12:02 -0800 (PST) From: Christoph Lameter To: David Chinner cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown In-Reply-To: <20070110230855.GF44411608@melbourne.sgi.com> Message-ID: References: <20070110223731.GC44411608@melbourne.sgi.com> <20070110230855.GF44411608@melbourne.sgi.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 766 Lines: 18 On Thu, 11 Jan 2007, David Chinner wrote: > Well, pdflush appears to be doing very little on both 2.6.18 and > 2.6.20-rc3. In both cases kswapd is consuming 10-20% of a CPU and > all of the pdflush threads combined (I've seen up to 7 active at > once) use maybe 1-2% of cpu time. This occurs regardless of the > dirty_ratio setting. That sounds a bit much for kswapd. How many nodes? Any cpusets in use? A upper maximum on the number of pdflush threads exists at 8. Are these multiple files or single file transfers? - 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/