From: bzzz@gerasimov.net Subject: Re: Fw: Re: ICP, 3ware, Areca? Date: Wed, 08 Nov 2006 00:06:22 +0300 Message-ID: References: <20061107114724.9c2cc644.akpm@osdl.org> <1162933193.8123.36.camel@kleikamp.austin.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andrew Morton , "linux-ext4@vger.kernel.org" Return-path: Received: from [80.71.248.82] ([80.71.248.82]:54743 "EHLO gw.home.net") by vger.kernel.org with ESMTP id S1752901AbWKGVHX (ORCPT ); Tue, 7 Nov 2006 16:07:23 -0500 To: Dave Kleikamp In-Reply-To: <1162933193.8123.36.camel@kleikamp.austin.ibm.com> (Dave Kleikamp's message of "Tue, 07 Nov 2006 14:59:52 -0600") Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org >>>>> Dave Kleikamp (DK) writes: DK> On Tue, 2006-11-07 at 11:47 -0800, Andrew Morton wrote: >> Why is ext3 slow?? DK> Allocation? I don't see anything indicating that Bill is overwriting an DK> existing file, so there is block allocation and journaling overhead. If DK> that's the case, it would be interesting to see how fast ext3 is when DK> overwriting a file. Extents and delayed allocation should improve on DK> this a lot. this was my first suspiction as well. though in my testing on opteron write achieved ~300MB/s consuming 100% cpu. so it would be interesting to see vmstat output and actual cpu consumption. thanks, Alex