Date: Mon, 23 Nov 1998 22:25:34 +0000 From: Nicolas Souchu <nsouch@teaser.fr> To: Peter Brevik <pb@ludd.luth.se> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: DMA boosted PPP via parallell port ..? Message-ID: <19981123222534.13906@breizh.prism.uvsq.fr> In-Reply-To: <199811231535.QAA01781@father.ludd.luth.se>; from Peter Brevik on Mon, Nov 23, 1998 at 04:35:07PM %2B0100 References: <199811231535.QAA01781@father.ludd.luth.se>
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Here is a 2 month old message about it... >>>>> Alex Povolotsky <tarkhil@asteroid.svib.ru> 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
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