From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262360AbTLBQcY (ORCPT ); Tue, 2 Dec 2003 11:32:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262373AbTLBQcY (ORCPT ); Tue, 2 Dec 2003 11:32:24 -0500 Received: from dci.doncaster.on.ca ([66.11.168.194]:35812 "EHLO smtp.istop.com") by vger.kernel.org with ESMTP id S262360AbTLBQcW (ORCPT ); Tue, 2 Dec 2003 11:32:22 -0500 To: Mike Fedyk Cc: Greg Stark , Erik Steffl , linux-kernel@vger.kernel.org Subject: Re: libata in 2.4.24? References: <3FCB8312.3050703@rackable.com> <87fzg4ckej.fsf@stark.dyndns.tv> <3FCBB15F.7050505@rackable.com> <3FCBB9F1.2080300@bigfoot.com> <87n0abbx2k.fsf@stark.dyndns.tv> <20031202055336.GO1566@mis-mike-wstn.matchmail.com> <20031202055852.GP1566@mis-mike-wstn.matchmail.com> In-Reply-To: <20031202055852.GP1566@mis-mike-wstn.matchmail.com> From: Greg Stark Organization: The Emacs Conspiracy; member since 1992 Date: 02 Dec 2003 11:31:45 -0500 Message-ID: <87zneb9o5q.fsf@stark.dyndns.tv> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Mike Fedyk writes: > > Libata, uses the scsi system instead of the existing ide layer because many > > new sata controllers are using an interface that is very similair to scsi > > (much like atapi). Now I have a different question. Does the scsi-like SATA interface include tcq? Because one of the long-standing issues with IDE drives and Postgres is the fact that even after issuing an fsync the data may be sitting in the drive's buffer. This doesn't happen with SCSI because the drives aren't forced to lie about the data being on disk in order to handle subsequent requests. Turning off write-caching on IDE drives absolutely destroys performance. Do the new SATA drives and controllers provide a solution to this? -- greg