Date: Sat, 07 Dec 1996 09:26:13 +0100 From: Poul-Henning Kamp <phk@critter.tfs.com> To: Bruce Evans <bde@zeta.org.au> Cc: grog@lemis.de, FreeBSD-current@freebsd.org Subject: Re: Problems with PLIP driver? Message-ID: <11505.849947173@critter.tfs.com> In-Reply-To: Your message of "Sat, 07 Dec 1996 14:23:43 %2B1100." <199612070323.OAA13164@godzilla.zeta.org.au>
next in thread | previous in thread | raw e-mail | index | archive | help
In message <199612070323.OAA13164@godzilla.zeta.org.au>, Bruce Evans writes: >>>1. There seem to be an abnormal number of errors on the line. In the >>> following, freebie is my FreeBSD machine, and papillon is the >>> laptop: >> >>Well, if there is a significant speed difference between the machines, >>you will have a problem. > >`speed' probably means the speed of the parallel port bus interface. >I haven't noticed any problems for connections between a P5/133 and >a 486/33, but I only ran PLIP for 10 minutes to test it. The P5's >ISA i/o is just as slow as the 486/33's. Well, depends on your hw really. Some of the multi-io chips that implement ECP/EPP are way faster than ISA. >Both together, that is. The old version of Linux PLIP that I'm >familiar with does extra i/o's for debouncing. It was about twice >as slow as FreeBSD PLIP (due to about twice as many i/o's). It >could be made much more reliable by doing a complete handshake. >This would also allow it to run reliably with interrupts enabled. >Then it might be another 5 times slower. OTOH, modern enhanced >parallel ports can go much faster. Well, feel free :-) -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@tfs.com TRW Financial Systems, Inc. Power and ignorance is a disgusting cocktail.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?11505.849947173>