netdev - Re: [PATCH] tcp: Fix for stalling connections

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Date:	Mon, 07 Dec 2009 01:32:51 +0100
From:	Damian Lukowski <damian@....rwth-aachen.de>
To:	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] tcp: Fix for stalling connections

Damian Lukowski schrieb:
> This patch fixes a problem in the TCP connection timeout calculation.
> Currently, timeout decisions are made on the basis of the current
> tcp_time_stamp and retrans_stamp, which is usually set at the first
> retransmission.
> However, if the retransmission fails in tcp_retransmit_skb(),
> retrans_stamp is not updated and remains zero. This leads to wrong
> decisions in retransmits_timed_out() if tcp_time_stamp is larger than
> the specified timeout, which is very likely.
> In this case, the TCP connection dies after the first attempted
> (and unsuccessful) retransmission.
> 
> With this patch, tcp_skb_cb->when is used instead, when retrans_stamp
> is not available.
> 
> Thanks to Ilpo Järvinen for code suggestions.

... and Frederic Leroy for testing. ;)
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