linux-kernel - Re: [PATCH net-next v2] tcp: Ensure DCTCP reacts to losses

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Date:   Thu, 04 Apr 2019 10:52:43 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     olivier.tilmans@...ia-bell-labs.com
Cc:     koen.de_schepper@...ia-bell-labs.com, research@...briscoe.net,
        brakmo@...com, fw@...len.de, borkmann@...earbox.net,
        ycheng@...gle.com, ncardwell@...gle.com, edumazet@...gle.com,
        agshew@...il.com, glenn.judd@...ganstanley.com,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] tcp: Ensure DCTCP reacts to losses

From: "Tilmans, Olivier (Nokia - BE/Antwerp)" <olivier.tilmans@...ia-bell-labs.com>
Date: Thu, 4 Apr 2019 12:24:02 +0000

> RFC8257 §3.5 explicitly states that "A DCTCP sender MUST react to
> loss episodes in the same way as conventional TCP".
...
> This patch replace the clamping of alpha by setting ssthresh to
> half of cwnd for both fast retransmissions and RTOs, at most once
> per RTT. Consequently, the dctcp_clamp_alpha_on_loss module parameter
> has been removed.

Applied to 'net' and queued up for -stable, thanks.