From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 10 Jan 2007 15:12:02 -0800 (PST) From: Christoph Lameter 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: owner-linux-mm@kvack.org Return-Path: To: David Chinner Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: 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, 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: email@kvack.org