Date: Tue, 12 Nov 2002 19:05:59 -0500 (EST) From: Nicolas Christin <nicolas@cs.virginia.edu> To: freebsd-hackers@FreeBSD.ORG Subject: Re: [hackers] Re: Netgraph could be a router also. Message-ID: <Pine.LNX.4.44.0211121854140.5250-100000@localhost.localdomain> In-Reply-To: <3DD1865E.B9C72DF5@mindspring.com>
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On Tue, 12 Nov 2002, Terry Lambert wrote: > 100mbit/s / 200kp/s = 500 bytes per packet > > ...and that an absolute top end. Somehow, I think the packets are > smaller. Just for the record... Measurement studies[1] (and NLANR traces[2]) suggest that the average packet size on the Internet is between 400-500 bytes, depending on the backbone link you're monitoring. According to the same studies/traces, packet size distribution can be approximated relatively accurately by a tri-modal distribution, with about 40% ~40 to 44-byte packets, 20% ~572 to 576-byte packets, and 20% 1500-byte packets. The 20 remaining percent are more or less uniformly distributed between 40 and 4000 bytes. This is all of course a rather crude approximation (which is not helped by the fact I'm quoting these numbers off the top of my head - I'll post a correction if I'm blatantly wrong, but I think my memory still works ok), but it may be helpful to get a rough idea of the 'typical' packet size one can observe. The point is, 200 Kpps should be relatively close to what you should see on a 100 Mbps FDX link. [1] http://www.caida.org/outreach/resources/learn/packetsizes [2] http://pma.nlanr.net/PMA/ Best, -- Nicolas Christin Ph.D. Candidate, University of Virginia, Computer Science http://www.cs.virginia.edu/~nicolas To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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