netdev - Re: [PATCH net-next] tcp: adjust tail loss probe timeout

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Message-Id: <20170719.161922.2049573872575990119.davem@davemloft.net>
Date:   Wed, 19 Jul 2017 16:19:22 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ycheng@...gle.com
Cc:     netdev@...r.kernel.org, ncardwell@...gle.com
Subject: Re: [PATCH net-next] tcp: adjust tail loss probe timeout

From: Yuchung Cheng <ycheng@...gle.com>
Date: Wed, 19 Jul 2017 15:41:26 -0700

> This patch adjusts the timeout formula to schedule the TCP loss probe
> (TLP). The previous formula uses 2*SRTT or 1.5*RTT + DelayACKMax if
> only one packet is in flight. It keeps a lower bound of 10 msec which
> is too large for short RTT connections (e.g. within a data-center).
> The new formula = 2*RTT + (inflight == 1 ? 200ms : 2ticks) which
> performs better for short and fast connections.
> 
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>

Applied, thanks!