netdev - Re: lowpri - RTO for unidirectional reciever

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Message-Id: <20081208.235622.149344934.davem@davemloft.net>
Date:	Mon, 08 Dec 2008 23:56:22 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	netdev@...r.kernel.org
Subject: Re: lowpri - RTO for unidirectional reciever

From: Rick Jones <rick.jones2@...com>
Date: Mon, 08 Dec 2008 18:02:01 -0800

> A Mac OSX bug was found/presumed, but there was an interesting
> behaviour on the linux receiver side as well - the rtx of the
> ignored FIN happened after what IIRC is the initial RTO.  It
> suggested that the ACK of the SYN|ACK didn't update the rtt estimate
> or if it did, didn't so so very much.  Bug? Feature?  No idea, but
> food for thought.

We should not use the SYN|ACK for RTT estimates.

It's a bug, and in fact we used to, but I fixed that long
ago.

Since there is no data in the packet, and it's therefore very small
compared to real data bearing packets, the RTT measured might be
artificially small and not really representative.
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