From owner-freebsd-current Mon Sep 14 14:56:11 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id OAA29519 for freebsd-current-outgoing; Mon, 14 Sep 1998 14:56:11 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from smtp04.primenet.com (smtp04.primenet.com [206.165.6.134]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id OAA29513 for ; Mon, 14 Sep 1998 14:56:07 -0700 (PDT) (envelope-from tlambert@usr05.primenet.com) Received: (from daemon@localhost) by smtp04.primenet.com (8.8.8/8.8.8) id OAA24797; Mon, 14 Sep 1998 14:55:47 -0700 (MST) Received: from usr05.primenet.com(206.165.6.205) via SMTP by smtp04.primenet.com, id smtpd024724; Mon Sep 14 14:55:39 1998 Received: (from tlambert@localhost) by usr05.primenet.com (8.8.5/8.8.5) id OAA00546; Mon, 14 Sep 1998 14:55:36 -0700 (MST) From: Terry Lambert Message-Id: <199809142155.OAA00546@usr05.primenet.com> Subject: Re: Download of FreeBSD 3.0-SNAP To: dg@root.com Date: Mon, 14 Sep 1998 21:55:36 +0000 (GMT) Cc: dan@math.berkeley.edu, freebsd-current@FreeBSD.ORG In-Reply-To: <199809141722.KAA16867@implode.root.com> from "David Greenman" at Sep 14, 98 10:22:02 am X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > >> >FreeBSD no longer does elevator sorts on data pending output, > >> >relying instead on the disk hardware to be smarter about this, > >> >especially given the likelihood that the drive is lying about > >> >its pysical geometry, making it unlikely that any sort you > >> >could do would result in an optimization. > > > >Even so, the driver should sort the I/O requests whenever the > >system's buffer queue for the drive exceeds the capacity of > >the system/host-adapter/drive for concurrently active commands. > >Since actual drive "geometry" is usually messy these days, > >a simple minded sort by block number would be appropriate. > > For the record, the quote that you sited above was Terry's, not mine, and > in any case doesn't match reality. As I already stated in a followup; I was mistaken about the code having been diked out in all cases; it was only diked out in some; which ones, I can't tell you right now. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message