netdev - Re: [PATCH v7 net-next 2/2] tcp: switch rtt estimations to usec resolution

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Message-ID: <530E9315.5080606@hp.com>
Date:	Wed, 26 Feb 2014 17:21:25 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Stephen Hemminger <stephen@...workplumber.org>,
	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, Julian Anastasov <ja@....bg>,
	Yuchung Cheng <ycheng@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Larry Brakmo <brakmo@...gle.com>
Subject: Re: [PATCH v7 net-next 2/2] tcp: switch rtt estimations to usec resolution

On 02/26/2014 05:09 PM, Stephen Hemminger wrote:
> Since srtt is scaled by 8 and is 32 bits, This does reduce the maximum
> possible RTT to 8 minutes or so. Which is fine, just wanted it to be
> noted.

I have encountered some situations recently, admittedly very 
pathological, where the RTT through a VPN connection was measured in 
minutes.  I don't think it got as high as 8 minutes, but it did get as 
high as three or so.  Also mentioned only for the record.

rick jones

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