Date: Fri, 1 Nov 2002 14:05:34 -0500 From: Don Bowman <don@sandvine.com> To: "'Fran.Lawas-Grodek@grc.nasa.gov'" <Fran.Lawas-Grodek@grc.nasa.gov>, Don Bowman <don@sandvine.com> Cc: Luigi Rizzo <rizzo@icir.org>, Cindy.Tran@grc.nasa.gov, freebsd-net@FreeBSD.ORG, Mark.Allman@grc.nasa.gov Subject: RE: Problem in High Speed and Long Delay with FreeBSD Message-ID: <FE045D4D9F7AED4CBFF1B3B813C8533701022E21@mail.sandvine.com>
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> From: Fran Lawas-Grodek [mailto:Fran.Lawas-Grodek@grc.nasa.gov] > Well... our development code that we are to ultimately test was > developed on 4.1, thus we really need to try to stick with 4.1. > It does not look like either of the above parameters are available > until 4.7. No worries. Have you checked that both sides are negotiating SACK? And both sides are negotiating a window scale option sufficiently large? (sounds like you need a window scale option of at least 5 bits?) And the socket-buffer to ttcp is actually being set as large as you think? (perhaps run 'ktrace' or 'truss' on ttcp and look for an error on the setsockopt). http://www.rfc-editor.org/rfc/rfc1323.txt has some other suggestions I think, but I'm guessing you've already gone over it. --don (don@sandvine.com www.sandvine.com) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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