Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264664AbUD1F37 (ORCPT ); Wed, 28 Apr 2004 01:29:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264662AbUD1F37 (ORCPT ); Wed, 28 Apr 2004 01:29:59 -0400 Received: from phoenix.infradead.org ([213.86.99.234]:55307 "EHLO phoenix.infradead.org") by vger.kernel.org with ESMTP id S264664AbUD1F35 (ORCPT ); Wed, 28 Apr 2004 01:29:57 -0400 Date: Wed, 28 Apr 2004 06:29:42 +0100 From: Christoph Hellwig To: Trond Myklebust Cc: Andrew Morton , sgoel01@yahoo.com, linux-kernel@vger.kernel.org Subject: Re: 2.6.6-rc{1,2} bad VM/NFS interaction in case of dirty page writeback Message-ID: <20040428062942.A27705@infradead.org> Mail-Followup-To: Christoph Hellwig , Trond Myklebust , Andrew Morton , sgoel01@yahoo.com, linux-kernel@vger.kernel.org References: <20040427011237.33342.qmail@web12824.mail.yahoo.com> <20040426191512.69485c42.akpm@osdl.org> <1083035471.3710.65.camel@lade.trondhjem.org> <20040426205928.58d76dbc.akpm@osdl.org> <1083043386.3710.201.camel@lade.trondhjem.org> <20040426225834.7035d2c1.akpm@osdl.org> <1083080207.2616.31.camel@lade.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <1083080207.2616.31.camel@lade.trondhjem.org>; from trond.myklebust@fys.uio.no on Tue, Apr 27, 2004 at 11:36:47AM -0400 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 991 Lines: 19 On Tue, Apr 27, 2004 at 11:36:47AM -0400, Trond Myklebust wrote: > writepage() only deals with one page at a time, so it will work fine for > doing stage 1. > If you also try force it to do stage 2, then you will end up with chunks > of size <= PAGE_CACHE_SIZE because there will only be 1 page on the NFS > private list of dirty pages. In practice this again means that you > usually have to send 8 times as many RPC requests to the server in order > to process the same amount of data. There's nothing speaking against probing for more dirty pages before and after the one ->writepage wants to write out and send the big request out. XFS does this to avoid creating small extents when converting from delayed allocated space to real extents. - 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/