From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 4 Aug 2007 18:56:04 +0200 From: Ingo Molnar Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-ID: <20070804165604.GA2310@elte.hu> References: <20070803123712.987126000@chello.nl> <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <20070804103347.GA1956@elte.hu> <20070804163733.GA31001@elte.hu> <20070804095143.b8cc2c78.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070804095143.b8cc2c78.akpm@linux-foundation.org> Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, neilb@suse.de, dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com, nikita@clusterfs.com, trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com, richard@rsk.demon.co.uk List-ID: * Andrew Morton wrote: > > yeah, it's really ugly. But otherwise i've got no real complaint > > about ext3 - with the obligatory qualification that > > "noatime,nodiratime" in /etc/fstab is a must. This speeds up things > > very visibly - especially when lots of files are accessed. It's kind > > of weird that every Linux desktop and server is hurt by a noticeable > > IO performance slowdown due to the constant atime updates, > > Not just more IO: it will cause great gobs of blockdev pagecache to > remain in memory, too. i tried to convince distro folks about it ... but there's fear, uncertainty and doubt about touching /etc/fstab and i suspect no major distro will do it until another does it - which is a catch-22 :-/ So i guess we should add a kernel config option that allows the kernel rpm maker to just disable atime by default. (re-enableable via boot-line and fstab entry too) [That new kernel config option would be disabled by default.] That makes it much easier to control and introduce. Ingo -- 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