netdev - Re: scp stalls mysteriously

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Message-ID: <20091206213229.3966c1a5@houba>
Date:	Sun, 6 Dec 2009 21:32:29 +0100
From:	Frederic Leroy <fredo@...rox.org>
To:	Damian Lukowski <damian@....rwth-aachen.de>
Cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Greg KH <gregkh@...e.de>
Subject: Re: scp stalls mysteriously

Le Sat, 05 Dec 2009 23:32:25 +0100,
Damian Lukowski <damian@....rwth-aachen.de> a écrit :
>
> Could you please make another test and unplug the cable or drop ACKs
> for several seconds, so that some RTO retransmissions are performed?
> I'd like to see if retrans_stamp remains constant. In the dmesg
> output of the 11th run, it seems to change while icsk_retransmits
> also increases. This is kind of bad for connection timeout
> calculation in the RTO case ...

.17 is online :)
I disconnected physically the stream 2 times. The first was maybe too
short and recover immediatly. The second disconnect is longer and
took several second to recover.
I hope this help !

-- 
Frédéric Leroy
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