Date: Fri, 25 Jan 2002 11:04:32 +0000 (GMT) From: Mike Silbersack <silby@silby.com> To: Dmitry Mottl <dima@sinp.msu.ru> Cc: freebsd-hackers@freebsd.org Subject: Re: strange TCP slowness... Message-ID: <20020125110114.B8543-100000@patrocles.silby.com> In-Reply-To: <Pine.BSF.4.43.0201251620550.16194-100000@BigKing.sinp.msu.ru>
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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
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