From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 22 Aug 2007 14:47:37 +0200 From: Andrea Arcangeli Subject: Re: huge improvement with per-device dirty throttling Message-ID: <20070822124736.GQ13915@v2.random> References: <1187764638.6869.17.camel@hannibal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org Return-Path: To: Andi Kleen Cc: "Jeffrey W. Baker" , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, Aug 22, 2007 at 01:05:13PM +0200, Andi Kleen wrote: > Ok perhaps the new adaptive dirty limits helps your single disk > a lot too. But your improvements seem to be more "collateral damage" @) > > But if that was true it might be enough to just change the dirty limits > to get the same effect on your system. You might want to play with > /proc/sys/vm/dirty_* The adaptive dirty limit is per task so it can't be reproduced with global sysctl. It made quite some difference when I researched into it in function of time. This isn't in function of time but it certainly makes a lot of difference too, actually it's the most important part of the patchset for most people, the rest is for the corner cases that aren't handled right currently (writing to a slow device with writeback cache has always been hanging the whole thing). -- 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