From owner-freebsd-net Mon Mar 29 15:28:39 1999 Delivered-To: freebsd-net@freebsd.org Received: from inner.net (avarice.inner.net [199.33.248.2]) by hub.freebsd.org (Postfix) with ESMTP id 129E714C18 for ; Mon, 29 Mar 1999 15:28:30 -0800 (PST) (envelope-from cmetz@inner.net) Received: from inner.net (cmetz.cstone.net [205.197.102.217]) by inner.net (8.9.1/8.9.1) with ESMTP id XAA11026; Mon, 29 Mar 1999 23:22:52 GMT Message-Id: <199903292322.XAA11026@inner.net> To: alk@pobox.com Cc: freebsd-net@FreeBSD.ORG Subject: Re: FreeBSD as a router In-reply-to: Your message of "Mon, 29 Mar 1999 15:34:58 CST." <14079.61724.162248.667212@avalon.east> X-Copyright: Copyright 1999, Craig Metz, All Rights Reserved. X-Reposting: With explicit permission only Date: Mon, 29 Mar 1999 18:27:03 -0500 From: Craig Metz Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org In message <14079.61724.162248.667212@avalon.east>, you write: >Since the discussion is occurring at this level, it is probably >helpful to note that the *size* of the packets also plays a large role >in determining maximum routing throughput: The box has to do a lot >more routing for 512B packets than it does for 1024B packets at the >same bandwidth. The box doesn't have to do "more routing" for a 512B packet than a 1024B packet, but, if you're filling the same number of bits/second, there are twice as many packets to move for 512B packets than for 1024B packets. (I believe this is what you meant, I just wanted to make sure people didn't get the wrong interpretation) Most router benchmarks like to talk about PPS as opposed to bits/second, and this is why -- most of the routing overhead is per-packet, not per-byte. >I'm guessing that a thorough search would show up some clock >vs. packet-size vs. bandwidth limit graphs for FreeBSD, Linux, >various commerical routers. I'd love to see well-done test data to substantiate or refute this sort of discussion; people know what the good and bad properties of the hardware and the software are and can take reasonably good guesses, but they're still just guesses and not measured performance numbers. I know that there is data out there, but I don't know how good it is. -Craig To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message