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Date: Wed, 27 Feb 2002 15:27:05 +0100
From: bert hubert <ahu@ds9a.nl>
To: Bjorn Wesen <bjorn.wesen@axis.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: What is TCPRenoRecoveryFail ?
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In-Reply-To: <Pine.LNX.3.96.1020227144128.18713E-100000@fafner.axis.se>; from bjorn.wesen@axis.com on Wed, Feb 27, 2002 at 01:46:55PM +0000
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On Wed, Feb 27, 2002 at 01:46:55PM +0000, Bjorn Wesen wrote:
> I have a TCP connection that is sending bulk data from a Linux 2.4.17
> machine to a client. At some point, one of the packets from the Linux
> machine is lost, so the client asks for a retransmit by acking the last
> received correct packet. Then the Linux machine just keeps filling the
> clients open window, ignoring that and subsequent retransmit requests,
> never retransmitting any data.

Please show a tcpdump -v of this happening, including the initial SYN
packets. I strongly suspect something in your network of mucking with TCP
options.

> Around the time of the packet loss happened, the counter
> TCPRenoRecoveryFail increased by one, but I'm not sufficiently into the
> TCP code to figure out why that happens and if that is the reason why
> Linux stop retransmitting anything.. any ideas ?

See RFC2001. Might well be related.

Regards,

bert

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