From owner-freebsd-hackers Mon Nov 23 12:38:08 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA13565 for freebsd-hackers-outgoing; Mon, 23 Nov 1998 12:38:08 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from reliam.teaser.fr (reliam.teaser.fr [194.51.80.12]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id MAA13546 for ; Mon, 23 Nov 1998 12:38:03 -0800 (PST) (envelope-from son@teaser.fr) Received: from teaser.fr (ppp1087-ft.teaser.fr [194.206.156.40]) by reliam.teaser.fr (8.9.1a/8.9.1a) with ESMTP id VAA25936; Mon, 23 Nov 1998 21:37:34 +0100 (MET) Received: (from son@localhost) by teaser.fr (8.9.1/8.8.5) id WAA00682; Mon, 23 Nov 1998 22:25:34 GMT Message-ID: <19981123222534.13906@breizh.prism.uvsq.fr> Date: Mon, 23 Nov 1998 22:25:34 +0000 From: Nicolas Souchu To: Peter Brevik Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: DMA boosted PPP via parallell port ..? References: <199811231535.QAA01781@father.ludd.luth.se> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.81e In-Reply-To: <199811231535.QAA01781@father.ludd.luth.se>; from Peter Brevik on Mon, Nov 23, 1998 at 04:35:07PM +0100 X-Operating-System: FreeBSD breizh 3.0-CURRENT FreeBSD 3.0-CURRENT Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Here is a 2 month old message about it... >>>>> Alex Povolotsky wrote: >Does PPP over LPT utilize byte-oriented exchange with FIFO, possible with >parralel port in EPP mode? Definitely no in -stable. It uses nybble mode transfers with a laplink-style cable. I'm not sure if anyone has implemented it in the ppbus device in -current (last time I brought up the subject in -hackers, no-one seemed to be working on it). The major problem with byte-wide transfers is that the port becomes half-duplex (it can't simultaneously read and write). This means that you need to add appropriate hand-shaking to resolve (or prevent) contention. This probably means a changing the driver to master- slave. Peter -- Peter Jeremy (VK2PJ) peter.jeremy@alcatel.com.au Alcatel Australia Limited 41 Mandible St Phone: +61 2 9690 5019 ALEXANDRIA NSW 2015 Fax: +61 2 9690 5247 <<<<< On Mon, Nov 23, 1998 at 04:35:07PM +0100, Peter Brevik wrote: > > >Would be a good idea to implement the "LapLink" PPP as a ECP mode DMA driven >PPP ..? Of course! > >I think advantages would be definitly both speed and less cpu load. Yes, but developper load would increase considerably ;) > >Have a ECP specification at: > http://wave.campus.luth.se/~pb/comp/standards/ecpmode.htm > When do you start ;) > > >When I use PPP via Laplink as it now. The computer is not particular useful >when transfer is in progress.. ;( > This is also due to the spl level of the plip driver which is splhigh(). Moreover, the driver polls the port :) > /Peter > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-hackers" in the body of the message > -- nsouch@teaser.fr / nsouch@freebsd.org FreeBSD - Turning PCs into workstations - http://www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message