Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752921AbXEDJqN (ORCPT ); Fri, 4 May 2007 05:46:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754607AbXEDJqN (ORCPT ); Fri, 4 May 2007 05:46:13 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:56671 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752921AbXEDJqL (ORCPT ); Fri, 4 May 2007 05:46:11 -0400 Date: Fri, 4 May 2007 10:46:10 +0100 From: Christoph Hellwig To: Anton Altaparmakov Cc: Bernd Eckenfels , linux-kernel@vger.kernel.org Subject: Re: Ext3 vs NTFS performance Message-ID: <20070504094610.GA31607@infradead.org> Mail-Followup-To: Christoph Hellwig , Anton Altaparmakov , Bernd Eckenfels , linux-kernel@vger.kernel.org References: <0733FB88-3E6E-47B7-A55D-704B5C0DB239@cam.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0733FB88-3E6E-47B7-A55D-704B5C0DB239@cam.ac.uk> User-Agent: Mutt/1.4.2.2i X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1206 Lines: 21 On Fri, May 04, 2007 at 09:12:31AM +0100, Anton Altaparmakov wrote: > Nothing to do with win32 functions. Windows does NOT create sparse > files therefore it never can have an issue like ext3 does in this > scenario. Windows will cause nice allocations to happen because of > this and the 1-byte writes are perfectly sensible in this regard. > (Although a little odd as Windows has a proper API for doing > preallocation so I don't get why it is not using that instead...) Which means the right place to fix this is samba. Samba just need to intersept lseek and pread/pwrite to never allocate sparse files but do the right thing instead. Now what the right thing would probably be a preallocate instead of writing zeroes, and we need to provide the infrastructure for them to do it, which is in progress currently. (And in fact samba already does the right thing for XFS if you use the prealloc samba vfs module, which AFAIK is not the default) - 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/