netdev - Re: [PATCH net-next] tcp: use TS opt on RTTs for congestion control

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Message-Id: <20170602.141946.1392617306892884152.davem@davemloft.net>
Date:   Fri, 02 Jun 2017 14:19:46 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     ycheng@...gle.com
Cc:     netdev@...r.kernel.org, ncardwell@...gle.com, edumazet@...gle.com,
        soheil@...gle.com
Subject: Re: [PATCH net-next] tcp: use TS opt on RTTs for congestion control

From: Yuchung Cheng <ycheng@...gle.com>
Date: Wed, 31 May 2017 11:30:53 -0700

> Currently when a data packet is retransmitted, we do not compute an
> RTT sample for congestion control due to Kern's check. Therefore the
> congestion control that uses RTT signals may not receive any update
> during loss recovery which could last many round trips. For example,
> BBR and Vegas may not be able to update its min RTT estimation if the
> network path has shortened until it recovers from losses. This patch
> mitigates that by using TCP timestamp options for RTT measurement
> for congestion control. Note that we already use timestamps for
> RTT estimation.
> 
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Also applied, thank you.