From owner-freebsd-hackers Fri Jan 25 10:52:58 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mailhub.yumyumyum.org (dsl092-171-091.wdc1.dsl.speakeasy.net [66.92.171.91]) by hub.freebsd.org (Postfix) with SMTP id C9E4B37B400 for ; Fri, 25 Jan 2002 10:51:52 -0800 (PST) Received: (qmail 20793 invoked by uid 1001); 25 Jan 2002 18:51:40 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 25 Jan 2002 18:51:40 -0000 Date: Fri, 25 Jan 2002 13:51:40 -0500 (EST) From: Kenneth Culver To: Mike Silbersack Cc: Dmitry Mottl , Subject: Re: strange TCP slowness... In-Reply-To: <20020125110114.B8543-100000@patrocles.silby.com> Message-ID: <20020125135101.Q20778-100000@alpha.yumyumyum.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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