From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751222AbWFSUjU (ORCPT ); Mon, 19 Jun 2006 16:39:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751220AbWFSUjU (ORCPT ); Mon, 19 Jun 2006 16:39:20 -0400 Received: from rwcrmhc11.comcast.net ([216.148.227.151]:1975 "EHLO rwcrmhc11.comcast.net") by vger.kernel.org with ESMTP id S1751151AbWFSUjT (ORCPT ); Mon, 19 Jun 2006 16:39:19 -0400 Message-ID: <44970B77.6030906@namesys.com> Date: Mon, 19 Jun 2006 13:39:19 -0700 From: Hans Reiser User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041217 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Akshat Aranya , vs CC: Miklos Szeredi , nix@esperi.org.uk, akpm@osdl.org, vs@namesys.com, hch@infradead.org, Reiserfs-Dev@namesys.com, Linux-Kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, drepper@redhat.com Subject: Re: batched write References: <44736D3E.8090808@namesys.com> <20060608121006.GA8474@infradead.org> <1150322912.6322.129.camel@tribesman.namesys.com> <20060617100458.0be18073.akpm@osdl.org> <4494411B.4010706@namesys.com> <87ac8an21r.fsf@hades.wkstn.nix> <449668D1.1050200@namesys.com> <4496D34F.4010007@namesys.com> In-Reply-To: X-Enigmail-Version: 0.90.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Akshat Aranya wrote: > On 6/19/06, Miklos Szeredi wrote: > >> > I would think that batched write is pretty essential then to FUSE >> > performance. >> >> Well, yes essential if the this is the bottleneck in write throughput, >> which is most often not the case, but sometimes it is. >> > > I can vouch for this. I did some experiments with an example FUSE > filesystem that discards the data in userspace. Exporting such a > filesystem over NFS gives us 80 MB/s writes when FUSE is modified to > write with 32K block sizes. With the standard FUSE (4K writes), we > get closer to 50 MB/s. The ratios of 4k performance / large write performance are amusingly similar for reiser4 and FUSE even though the filesystems and absolute performance are totally different. The principle is the same it seems for both filesystems. Vladimir, the benchmarks, please send them..... Hans