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... Message-ID: <20020125135101.Q20778-100000@alpha.yumyumyum.org> In-Reply-To: <20020125110114.B8543-100000@patrocles.silby.com>
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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 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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