From owner-freebsd-hackers Fri May 3 15:35:04 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id PAA16575 for hackers-outgoing; Fri, 3 May 1996 15:35:04 -0700 (PDT) Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.211]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id PAA16570 for ; Fri, 3 May 1996 15:35:01 -0700 (PDT) Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id PAA15008; Fri, 3 May 1996 15:26:05 -0700 From: Terry Lambert Message-Id: <199605032226.PAA15008@phaeton.artisoft.com> Subject: Re: using DLT drive on FreeBSD To: wilko@yedi.iaf.nl (Wilko Bulte) Date: Fri, 3 May 1996 15:26:04 -0700 (MST) Cc: joerg_wunsch@uriah.heep.sax.de, freebsd-hackers@FreeBSD.ORG In-Reply-To: <199605031838.UAA01522@yedi.iaf.nl> from "Wilko Bulte" at May 3, 96 08:38:54 pm X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > > > I think the 2.1R limit is 32kbytes. In the recent past there was a > > > discussion about this on this list (in relation to DAT drives??). > > > > 64 KB, this is enforced by physio(9) [man page not yet written :)]. > > Many SCSI adapters do only allow for 16 scatter/gather segments, and > > in the worst case, you need one of them for each physical page. > > This would imply that non-SG adapters are unusable. Correct me if I'm > wrong but something like a Seagate ST-02 (junk, I know, but sea(4) > is available) does not do SG. No, it just means they are slow, since they have to use software. Luckily, those things don't come with boot ROM's, so you have to go out of your way to use them in the first place. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.