Date: Fri, 12 Apr 1996 11:29:29 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: nathan@netrail.net (Nathan Stratton) Cc: terry@lambert.org, freebsd-question@freebsd.org, freebsd-current@freebsd.org Subject: Re: What is the max network IO on a FreeBSD box? Message-ID: <199604121829.LAA02199@phaeton.artisoft.com> In-Reply-To: <Pine.LNX.3.92.960412003055.32385A-100000@netrail.net> from "Nathan Stratton" at Apr 12, 96 00:39:45 am
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> > Everything after that tends to be latency, assuming you have a very > > fast box. Latency translates into pool retention time, which for > > any given bandwidth translates into memory requirements. > > How fast of a CPU should I get? P5 133, 160, should I go to P6? Garrett or someone else would have to answer this... sorry. > > T1 is slow; it shouldn't be a problem. The best number's I've seen > > for FDDI is 60-something Mbit/S... 2/3's of one wire bandwidth. > > > > You should go over the list archives for the -current list to get the > > actual performance figures on the 100 Mbit/S tests (I didn't run them, > > I'm just quoting from memory). > > Ya, have been looking, but have not found any performance figures yet. This > is what I want to do: Well, they are there somewhere... 8-). I remember the posting clearly; it was in response to some Linux advocacy. (diagram with largest pip a 24Mbps frac T3) The smallest throughput I saw on the posting was in the range of 40Mbps, but I don't know what the FDDI loading would be in your setup -- it would really depend on the traffic distribution and where you endpoint which customer T1's relativce to where they want to go. This type of application is generally better served by dedicated router hardware if latency is an issue. I know T3 hardware isn't terrificaly common. At the university of Utah on WestNet, the T3 to Denver was demuxxed into T1's by a dedicated rack-mount RS6000 because no other hardware was avilable at the time. Just a cautionary note... I have no idea what the latency would be, other than to know Dennis has complained of it in the past. > I am going to try SDL's PCI T3 cards, and the DEC FDDI cards. I want to > make sure this will work so this new frac T3 customer will not get > screwed. If this will not work the only other thing I know of is a Cisco > 7505 and that is BIG bucks, min system that will work for 2 FDDI and 1 T3 > is about $57,000. If anyone has any info on this let me know. I know I can > get the bandwidth from MCI and our MAE-East to cover the new frac T3 > connection, but not sure if the FreeBSD routers will do it. I think you need to work directly with Garrett Wollman and the other real networking guru's (I don't count myself as a networking guru, and you probably shouldn't either). I think that this type of application should be optimized for... it's quite a win, and it gives people who use FreeBSD this way a leg up on IPv6 and multicast support not available from some of the normal hardware vendors. And, as you point out, the hardware is a *lot* cheaper. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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