From owner-freebsd-net  Fri Nov 30 12:32:25 2001
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	(envelope-from jayanth)
Date: Fri, 30 Nov 2001 12:32:17 -0800
From: jayanth <jayanth@yahoo-inc.com>
To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: Jonathan Lemon <jlemon@flugsvamp.com>, net@FreeBSD.ORG
Subject: Re: TCP anomalies (was Re: FreeBSD performing worse than Linux?)
Message-ID: <20011130123217.A70081@yahoo-inc.com>
References: <local.mail.freebsd-net/20011128102241.6887B380A@overcee.netplex.com.au> <local.mail.freebsd-net/20011128112006.195983808@overcee.netplex.com.au> <local.mail.freebsd-net/20011129105321.C74413@monorchid.lemis.com> <local.mail.freebsd-net/200111290113.fAT1DnH04474@khavrinen.lcs.mit.edu> <local.mail.freebsd-net/200111300518.fAU5IXx11078@c527597-a.cstvl1.sfba.home.com> <200111300647.fAU6l9K60404@prism.flugsvamp.com> <200111301758.fAUHwSP28351@khavrinen.lcs.mit.edu>
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In-Reply-To: <200111301758.fAUHwSP28351@khavrinen.lcs.mit.edu>; from wollman@khavrinen.lcs.mit.edu on Fri, Nov 30, 2001 at 12:58:28PM -0500
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Garrett,

Can you run these tests again with rfc1323 off ?

jayanth

Garrett Wollman (wollman@khavrinen.lcs.mit.edu) wrote:
> <<On Fri, 30 Nov 2001 00:47:09 -0600 (CST), Jonathan Lemon <jlemon@flugsvamp.com> said:
> 
> [Quoting Bruce Mah:]
> 
> >> happens.  In *most* cases, the receiver somehow gets the missing data
> >> because you can later see it acking later sequence numbers.  The first
> >> place I saw this was at :41.504152.
> 
> Those are not duplicate acks because the window is still getting updated.
> 
> >> Another place to look is the large number of consecutive dupacks
> >> starting around :41.978767.  I don't know what's happening here, but
> >> after a long time (about a second?!?) the sender finally gives up and
> >> sends the receiver what it wants.
> 
> > Yes, I think that area (I was looking at it too) provides a fairly
> > good illustration that fast retransmits are broken.  The transmit 
> > at 14:01:42.969338 appears to be the retransmit timer finally kicking in.
> 
> Yes, that's the conclusion Tim Shepard and I came to as well.
> 
> -GAWollman
> 
> 
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