Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751448AbVKBALW (ORCPT ); Tue, 1 Nov 2005 19:11:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751465AbVKBALW (ORCPT ); Tue, 1 Nov 2005 19:11:22 -0500 Received: from mail.avalus.com ([195.82.114.197]:64708 "EHLO shed.alex.org.uk") by vger.kernel.org with ESMTP id S1751448AbVKBALV (ORCPT ); Tue, 1 Nov 2005 19:11:21 -0500 Date: Wed, 02 Nov 2005 00:11:10 +0000 From: Alex Bligh - linux-kernel Reply-To: Alex Bligh - linux-kernel To: Florian Weimer , Lawrence Walton Cc: Alex Bligh - linux-kernel , LKML Subject: Re: 3ware 9550SX problems - mke2fs incredibly slow writing last third of inode tables Message-ID: In-Reply-To: <87wtjs8f54.fsf@mid.deneb.enyo.de> References: <87oe54cza8.fsf@mid.deneb.enyo.de> <20051101170413.GA11640@the-penguin.otak.com> <87wtjs8f54.fsf@mid.deneb.enyo.de> X-Mailer: Mulberry/4.0.4 (Win32) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1424 Lines: 36 --On 01 November 2005 18:13 +0100 Florian Weimer wrote: >>> In my experience, the 3ware SATA controllers which are not NCQ-capable >>> have very, very lousy write performance with some drives, unless you >>> enable the write cache (which is, of course, a bit dangerous without >>> UPS or battery backup on the controller). > >> Not to sound like the a 3ware chearleader, but this card does support >> NCQ. > > Oh. I didn't know whether this particukar controller supported NCQ or > not. It even supports SATA-3, not much good that it does me. I managed to format it reiserfs in the end. dbench (yes I know it isn't a great benchmark) gives me a write speed of 7Mb/s compared to 700Mb/s if one of the disks in the array is attached to the motherboard SATA controller. 7Mb/s is quite stunningly appalling. I realise the release notes warn of slow writes, but that's just daft! I have a few bits in my setup to check before I start pointing the finger comprehensively. It may (for instance) be a large partition problem (suggested on the ext2 list). I'm taking it that it works at least for some people (did you test write speed Lawrence?). -- Alex Bligh - 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/