Date: Sat, 5 Jan 2002 11:55:47 -0700 From: Nate Williams <nate@yogotech.com> To: "M. Warner Losh" <imp@village.org> Cc: drwilco@drwilco.net, freebsd-hackers@FreeBSD.ORG Subject: Re: path_mtu_discovery Message-ID: <15415.19507.503984.613417@caddis.yogotech.com> In-Reply-To: <20020104.230218.17343558.imp@village.org> References: <5.1.0.14.0.20020105011402.01d75230@mail.drwilco.net> <20020104.230218.17343558.imp@village.org>
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> : Out of curiosity, where do MTUs < ~512 occur? > > Old slip links that used it to reduce latency. I suspect that there > aren't too many of them left in the world. You'd be suprised. I measure SLIP's effeciency (in throughput) to be about 5-15% more effecient than PPP in older versions of FreeBSD (both using kernel versions, slip and ppp). Since both were using static configurations on both ends and the only traffic was TCP/IP, there was no reason to use PPP over SLIP so we opted for using the more effecient protocol. I can imagine this is SLIP is still more effecient than PPP in terms of CPU, although I haven't measured it in years. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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