Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932377Ab0BENJG (ORCPT ); Fri, 5 Feb 2010 08:09:06 -0500 Received: from borg.medozas.de ([188.40.89.202]:38105 "EHLO borg.medozas.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751745Ab0BENJC (ORCPT ); Fri, 5 Feb 2010 08:09:02 -0500 Date: Fri, 5 Feb 2010 14:09:01 +0100 (CET) From: Jan Engelhardt To: Jens Axboe cc: Linux Kernel Mailing List Subject: Re: kswapd continuously active In-Reply-To: <20100205130002.GI1025@kernel.dk> Message-ID: References: <20100125130627.GO13771@kernel.dk> <20100205130002.GI1025@kernel.dk> User-Agent: Alpine 2.01 (LSU 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1584 Lines: 45 On Friday 2010-02-05 14:00, Jens Axboe wrote: >> >January 25 Feb-05 >> >MemTotal: 8166752 kB 8166752 >> >MemFree: 3243552 kB 3781776 >> >Buffers: 207968 kB 4912 >> >Cached: 2728216 kB 2684400 >> >SwapCached: 0 kB 0 >> >Active: 2203136 kB 495624 >> >Inactive: 2152544 kB 3263136 >> >Active(anon): 1167256 kB 488168 >> >Inactive(anon): 252952 kB 583912 >> >Active(file): 1035880 kB 7456 >> >Inactive(file): 1899592 kB 2679224 >> >Unevictable: 0 kB 0 >> >Mlocked: 0 kB 0 >> >SwapTotal: 0 kB 0 >> >SwapFree: 0 kB 0 >> >Dirty: 141624 kB 2662184 >> >Writeback: 0 kB .. >> >> Today this happened again. So I looked at /proc/meminfo to paste today's >> values next to those from January. That is when I noticed the "Dirty" >> value - and thus I ran >> >> watch -d -n 1 'grep Dirty /proc/meminfo' >> >> What I see is that the dirty amount - a sync is currently running - >> only decreases with at most 400 KB/sec, often less than that. > >I'm guessing the barriers and commits are what is killing your >performance. What happens with barrier=0? The ext4 filesystem is already mounted with barrier=0. If there is any block-level barriers I also can turn off, what would be the command? thanks, Jan -- 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/