Date: Thu, 1 Aug 1996 20:40:14 -0400 (EDT) From: rhh@ct.picker.com (Randall Hopper) To: norton@nrlmry.navy.mil Cc: hackers@freebsd.org Subject: Re: PPP vs. PLIP Message-ID: <199608020040.UAA09666@elmer.picker.com> In-Reply-To: <199608011902.MAA05218@norton.nrlmry.navy.mil> from "norton@nrlmry.navy.mil" at Aug 1, 96 12:02:58 pm
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norton@nrlmry.navy.mil: >I just picked up a microcom modem for connecting to my ISP (they hook >into a T1). They are running microcom modems also. This is a 28.8 >modem. > >The modem info says that you can hook it up to either a serial port or >a parallel port - and claims that the parallel port arrangement will >give you about 3x the throughput. > >I was wondering if anyone had any feedback as to if you would really >see higher bandwidth running through the parallel port (using PLIP, I ... >terms of both speed and reliability? From what I can tell, I get >about 18kbits/sec on things like ftp's currently. If you've got a fast serial port (16550 -- 16 byte FIFO), that's plenty fast enough to handle 28.8K dial-up connection even with full data compression on (56K-60K or so for highly compressible content). Also to my knowledge, FreeBSD supports FIFOs on fast serial ports, but doesn't support the advanced features of ECP/EPP parallel ports. So I think you'd have less system overhead with SLIP or PPP over a fast serial port (though at dial-up speeds I really don't know whether it'd make a noticable difference). Randall Hopper rhh@ct.picker.com
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