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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!panix!news.panix.com!not-for-mail From: tls@panix.com (Thor Lancelot Simon) Newsgroups: comp.unix.admin,comp.protocols.ppp,comp.unix.questions,comp.unix.bsd.freebsd.misc,comp.unix.bsd.netbsd.misc Subject: Re: Best Unix for SLIP/PPP Server- Best Reliability/Cost? Date: 16 Nov 1996 17:11:38 -0500 Organization: Panix Lines: 28 Message-ID: <56le6q$2c6@panix2.panix.com> References: <56cfhc$h8b@access5.digex.net> <56d1m9$9ba@server05.icaen.uiowa.edu> <56dl8p$rje@panix2.panix.com> <56igd8$if@anorak.coverform.lan> Reply-To: tls@rek.tjls.com NNTP-Posting-Host: panix2.panix.com Xref: euryale.cc.adfa.oz.au comp.unix.admin:50500 comp.protocols.ppp:15910 comp.unix.questions:91377 comp.unix.bsd.freebsd.misc:31102 comp.unix.bsd.netbsd.misc:4865 In article <56igd8$if@anorak.coverform.lan>, Brian Somers <brian%anorak.coverform.lan@awfulhak.demon.co.uk> wrote: >In article <56dl8p$rje@panix2.panix.com>, > tls@panix.com (Thor Lancelot Simon) writes: >: Maybe. If you can do it all in one piece, why spend the dough on the terminal >: servers? The real question is how many serial ports he can put in a PC before >: the thing has such a tremendous interrupt load that it can't get anything else >: done. > >I suspect this is why briang suggested the terminal server idea (despite >the original poster saying he didn't want to use one) in the first place. >Even if you have one IRQ for 16 ports, you're only really looking at 80 >direct serial connections per pc. This is not what "interrupt load" means. Go read some code, or at least some theory. Curt pointed out that much of the larger multi-port serial-port hardware for PCs is polled. I'm interested in the impact of this on throughput on those serial ports; Curt, can you tell me more? I still think those Cirrus PPP-UARTS are way cool; I wish someone would build cards for PCs that used them, other than the Cirrus demonstrator. I've got programming specs, too. -- Thor Lancelot Simon tls@panix.COM There's nothing like rancid bear fat to keep you happy. -Perry Metzger