Date: Thu, 30 Nov 1995 13:52:27 -0800 From: David Greenman <davidg@Root.COM> To: "Garrett A. Wollman" <wollman@lcs.mit.edu> Cc: gpalmer@westhill.cdrom.com, questions@freebsd.org Subject: Re: IPX status and routing Message-ID: <199511302152.NAA02372@corbin.Root.COM> In-Reply-To: Your message of "Thu, 30 Nov 95 10:34:49 EST." <9511301534.AA08546@halloran-eldar.lcs.mit.edu>
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><<On Wed, 29 Nov 1995 18:33:21 -0800, gpalmer@westhill.cdrom.com said: > >> 2) I doubt it. Dedicated routers can do slightly faster packet >> switching as they start routing when they've recieved the header, >> whereas BSD has to wait for the entire packet. > >A good PCI machine (like a 100-MHz Dell I have in the lab) with good >PCI interfaces (like the DE500s we have in that machine) can forward >about 15,000 minimally-sized packets per second (all to the same >destination, but my tests indicate that this shouldn't matter). That >comes to about 7.7 Mbit/s. Not as fast as we would like, but well >within the envelope for most uses. (This load is from an input stream >of 18,000 packets per second over Fast Ethernet.) For larger packets, >the rate goes down somewhat. The maximum packet rate given overhead, collisions, and minimum ethernet packet size (60 bytes) is about 12,500 packets/second. ...so 15,000 packets/ second is higher than what normal ethernet can do for one interface. On the other hand, fast ethernet should be about 10 times that...so we have a long way to go to get to 125,000 packets/second. :-) -DG
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