From owner-freebsd-hackers  Fri Jan 25 10:52:58 2002
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Date: Fri, 25 Jan 2002 13:51:40 -0500 (EST)
From: Kenneth Culver <culverk@yumyumyum.org>
To: Mike Silbersack <silby@silby.com>
Cc: Dmitry Mottl <dima@sinp.msu.ru>, <freebsd-hackers@FreeBSD.ORG>
Subject: Re: strange TCP slowness...
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Yeah, I guess it could be packet collision or something... are you
connecting the computers through a hub?

Ken

On Fri, 25 Jan 2002, Mike Silbersack wrote:

>
> On Fri, 25 Jan 2002, Dmitry Mottl wrote:
>
> > Hi, All
> >
> > Sorry, for posting a big dump, but it is needed for understanding
> > the problem.
> >
> > I have very slow tcp connection between two computers on the same LAN
> > This computers uses FreeBSD 4.4 GENERIC kernel
> >
> > This is a TCPDUMP for and passive ftp transfer
> >
> > As you can see the transfer stops every 1 second!!!
> > So the question is WHY??
> > All sysctl variables are identical
> > I'm not using firewalls or traffic shappers
>
> Well, from this trace it's clear that packet loss is occuring; the 1
> second delays are retransmit timeouts, nothing unexpected there.  As far
> as I can tell from looking at the trace, the problem is not a fault in
> FreeBSD's tcp stack, but rather something hardware related.  I'd suggest
> changing network cards on host A to see if that makes a difference.
>
> Mike "Silby" Silbersack
>
>
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