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Date: Thu, 4 Apr 2019 09:55:19 -0400
From: Neal Cardwell <ncardwell@...gle.com>
To: "Tilmans, Olivier (Nokia - BE/Antwerp)"
<olivier.tilmans@...ia-bell-labs.com>
Cc: "De Schepper, Koen (Nokia - BE/Antwerp)"
<koen.de_schepper@...ia-bell-labs.com>,
Bob Briscoe <research@...briscoe.net>,
Lawrence Brakmo <brakmo@...com>,
Florian Westphal <fw@...len.de>,
Daniel Borkmann <borkmann@...earbox.net>,
Yuchung Cheng <ycheng@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Andrew Shewmaker <agshew@...il.com>,
Glenn Judd <glenn.judd@...ganstanley.com>,
"David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] tcp: Ensure DCTCP reacts to losses
On Thu, Apr 4, 2019 at 9:48 AM Neal Cardwell <ncardwell@...gle.com> wrote:
>
> On Thu, Apr 4, 2019 at 8:24 AM Tilmans, Olivier (Nokia - BE/Antwerp)
> <olivier.tilmans@...ia-bell-labs.com> wrote:
> >
> > From: Koen De Schepper <koen.de_schepper@...ia-bell-labs.com>
> >
> > RFC8257 ยง3.5 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.
>
> Acked-by: Neal Cardwell <ncardwell@...gle.com>
>
> Thanks!
FWIW, my vote is that this is an important bug fix that is appropriate
for the net branch and -stable releases, rather than net-next.
neal
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