netdev - Re: lowpri - RTO for unidirectional reciever

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Date:	Tue, 09 Dec 2008 11:25:19 -0800
From:	Rick Jones <rick.jones2@...com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org
Subject: Re: lowpri - RTO for unidirectional reciever

David Miller wrote:
> 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.

A miracle occurs going from zero bytes of payload but several bytes of 
TCP options (scale and MSS) to having one byte of payload and no bytes 
of options? (Timestamp options remaining the same in both cases)

rick jones

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