Date: Fri, 6 Nov 2009 15:30:39 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: Rui Paulo <rpaulo@FreeBSD.org> Cc: freebsd-current@FreeBSD.org Subject: Re: Help needed: TCP Wizards (was 8.0-RC1 NFS client timeout issue) Message-ID: <Pine.GSO.4.63.0911061515480.25268@muncher.cs.uoguelph.ca> In-Reply-To: <030A8229-9707-4F70-B4BE-584F1BF9ECEC@FreeBSD.org> References: <Pine.GSO.4.63.0911011644410.19276@muncher.cs.uoguelph.ca> <4AF0B7DF.9030405@freebsd.org> <Pine.GSO.4.63.0911051121340.5409@muncher.cs.uoguelph.ca> <030A8229-9707-4F70-B4BE-584F1BF9ECEC@FreeBSD.org>
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On Thu, 5 Nov 2009, Rui Paulo wrote: > > Are you running TSO? > Wow, I owe you a beer:-) That was the magic bullet... I'm a dinosaur, so when I first saw this, I thought of that wonderful time sharing front end to IBM mainframes I had the priviledge of using in the 70s. (There was also a TSO emulator in the early Unix releases, which set your terminal to the worst possible setting imaginable and introduced delays of seconds when you tried to do anything. It was pretty funny for those of us who had experienced the real thing.) Anyhow, I figured you probably didn't mean this so I grep'd around and found net.inet.tcp.tso, set it to 0 and...the problem went away. (I have gotten a RST for the new port# once since then, but it was in the middle of the 3way handshake instead of after it, so it didn't cause any grief, just another 3way handshake right away.) I have no idea if the problem is something generic w.r.t. TSO or specific to the Intel 82801BA/CAM and/or the fxp driver for it. (I checked and none of the other net cards I have lying around have TSO support, so I can't test this by replacing the net card/driver.) Does anyone know enough about TSO to know if the problem is net chip specific of generic to using it? Thanks for the help. I don't think I would have ever found that, rick
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