Date: Wed, 20 Mar 1996 12:19:40 -0600 (CST) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: nate@sri.MT.net (Nate Williams) Cc: freebsd-isp@freefall.FreeBSD.org Subject: Re: Microsoft "Get ISDN"? Message-ID: <199603201819.MAA29896@brasil.moneng.mei.com> In-Reply-To: <199603191550.IAA04017@rocky.sri.MT.net> from "Nate Williams" at Mar 19, 96 08:50:13 am
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> > I am curious, why do you use SLIP for your dedicated connections? > > I don't speak for Joe, but I use SLIP (w/VJ compression) whenever > possible since it uses less overhead and I seem to have lower latency > and higher throughput than using both user-mode and kernel-mode PPP on > FreeBSD boxes. I don't have anything to say about higher throughput since in my experience it's only a mild difference, but the latency issue is mainly due to ppp's default 1500 mtu. Lowering that (I know one fella who uses 296) will help latency issues quite a bit. With 1500, you only get two or three packets per second through the link if somebody is running a large transfer of some sort. Most sites which run dedicated connections will have multiple people using the link simultaneously, so the lower mtu gives the impression of faster response. This hurts overall throughput mildly, buuuuut there's always a tradeoff to be made. fyi: SLIP uses a 552 mtu. ... Joe ------------------------------------------------------------------------------- Joe Greco - Systems Administrator jgreco@ns.sol.net Solaria Public Access UNIX - Milwaukee, WI 414/546-7968
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