From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: I/O Request [Elevator; Clustering; Scatter-Gather] Date: Tue, 4 Mar 2003 15:20:41 +0100 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20030304142041.GA660@suse.de> References: <20030304133201.18619.qmail@mail.com> <20030304135000.GA29990@suse.de> <20030304141948.264C63BF9D@mx01.nexgo.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20030304141948.264C63BF9D@mx01.nexgo.de> List-Id: linux-scsi@vger.kernel.org To: Daniel Phillips Cc: David Anderson , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org On Tue, Mar 04 2003, Daniel Phillips wrote: > On Tuesday 04 March 2003 14:50, Jens Axboe wrote: > > > Do Clustering of request and scatter-gather mean the same ?? Confused > > > to the core... Kindly help me ... > > > > No, the elevator clustering refers to clustering request that are > > contigious on disk. Scatter-gather may cluster sg entries that are > > contigious in memory. > > Hi Jens, > > I think you meant to write *non*contiguous in memory (but contiguous on the > device). No I didn't. Well actually both may happen, depending on your hardware. What I wrote covers basic x86 hardware. -- Jens Axboe