From owner-freebsd-current Mon Dec 1 13:26:21 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id NAA20342 for current-outgoing; Mon, 1 Dec 1997 13:26:21 -0800 (PST) (envelope-from owner-freebsd-current) Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id NAA20296 for ; Mon, 1 Dec 1997 13:26:00 -0800 (PST) (envelope-from toor@dyson.iquest.net) Received: (from root@localhost) by dyson.iquest.net (8.8.7/8.8.8) id QAA04181; Mon, 1 Dec 1997 16:25:20 -0500 (EST) (envelope-from toor) From: "John S. Dyson" Message-Id: <199712012125.QAA04181@dyson.iquest.net> Subject: Re: FYI: usage of new AIO calls In-Reply-To: <199712012109.OAA12464@mt.sri.com> from Nate Williams at "Dec 1, 97 02:09:10 pm" To: nate@mt.sri.com (Nate Williams) Date: Mon, 1 Dec 1997 16:25:20 -0500 (EST) Cc: toor@dyson.iquest.net, nate@mt.sri.com, current@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL31 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Nate Williams said: > > > What is a VCHR device? You mention it quite a lot in the commit > > > messages, but I have no idea what it is, unless it's like a acronym > > > cross combining VHS and VCR. :) > > > > RAW disk I/O is an example. > > But, what is it? Raw disk I/O is an example of many things unrelated to > VCHR, so telling me an example of something still doesn't tell me what a > VCHR device is. > I am surprised, do you really not know? The AIO/LIO code was primarily included to support optimized database operations, and I/O is often done to raw disks. -- John dyson@freebsd.org jdyson@nc.com