From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267036AbUBMOoR (ORCPT ); Fri, 13 Feb 2004 09:44:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267037AbUBMOoR (ORCPT ); Fri, 13 Feb 2004 09:44:17 -0500 Received: from mail.gmx.de ([213.165.64.20]:57304 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S267036AbUBMOoP (ORCPT ); Fri, 13 Feb 2004 09:44:15 -0500 Date: Fri, 13 Feb 2004 15:44:13 +0100 (MET) From: "Daniel Blueman" To: linux-kernel@vger.kernel.org MIME-Version: 1.0 References: <20040213142719.GA28100@mail.shareable.org> Subject: Re: File system performance, hardware performance, ext3, 3ware RAID1, etc. X-Priority: 3 (Normal) X-Authenticated: #8973862 Message-ID: <17899.1076683453@www11.gmx.net> X-Mailer: WWW-Mail 1.6 (Global Message Exchange) X-Flags: 0001 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org It is a small loss that the TCQ-support implementation hasn't been stable on linux so far. I guess mostly due to the great I/O scheduling Linux has (ie anticipatory scheduler). Yes, a growing number of IDE disk manufacturers are using native S-ATA controllers in their disks, and TCQ is one of the core features (ie unique selling point), as well as being implemented on the more lavish P-ATA controllers. It's just a shame that there are still issues saturating a bunch of IDE disks with software RAID in the 2.6 series, but I guess that'll be ironed out in time... > Daniel Blueman wrote: > > many modern IDE disks and > > controllers also have tagged command queuing, so it is even more of a > corner case. > > Linux doesn't use tagged command queueing, though - the code has been > disabled for some time. I thought the TCQ stuff was disabled because > only very few disks supported it and the code wasn't reliable. > > Yet you say many modern disks support it? > > -- Jamie > -- Daniel J Blueman GMX ProMail (250 MB Mailbox, 50 FreeSMS, Virenschutz, 2,99 EUR/Monat...) jetzt 3 Monate GRATIS + 3x DER SPIEGEL +++ http://www.gmx.net/derspiegel +++