Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc8312bis-06.txt

Yoshifumi Nishida <> Sun, 06 February 2022 11:03 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 708B53A2321 for <>; Sun, 6 Feb 2022 03:03:20 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.838
X-Spam-Status: No, score=-1.838 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (2048-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id 1LcZ0yUYFNjG for <>; Sun, 6 Feb 2022 03:03:17 -0800 (PST)
Received: from ( [IPv6:2607:f8b0:4864:20::72e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by (Postfix) with ESMTPS id 141143A2436 for <>; Sun, 6 Feb 2022 03:02:44 -0800 (PST)
Received: by with SMTP id c189so8663429qkg.11 for <>; Sun, 06 Feb 2022 03:02:44 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SeVA0JYtYOWNW0lqsHNxuDP9xawlCBscRGdNVWt+Igw=; b=YJ39vu+fCbPaZMHSJ5/QUeLoQu6Oo0XJdh4iGbBZaM+yYxKmvYF6F3XRSJtS9grc8C /WcVXpiW6qYhbUDhv/MP8J5pocWs7Qe+yMnm8IvtT4P12VWuN/+9QfgdbuveJtnyMjpo abGd8HW9RznwC26fnD5fOuRRmhziIilByBM0NG9HV5mPlBthXlhW+V8mGX2Qfcp/u/Rn QopuBfOc3GCxHWIeqtcP7AQMPhJw/FhvPRBOFphr3Vi0S9GPxJVLSDGtu4srUEEVWP46 wntLx3JB9WdaOjW61M1wlgd1ogAzk0vNhuocYCcUPfVadqRdU+/cjUHjMRMvDJLuwdS1 xUuw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SeVA0JYtYOWNW0lqsHNxuDP9xawlCBscRGdNVWt+Igw=; b=kHRT6dqTn6TwT0CriYnt4yTtPktBLNEuzxoazPt5A8vw2y1lr5BoB6lZ+GAAmGIQDX BjT0KmZOTB+1KzxwuDjgIaMpoKDwHjDizRRffur5e9Vp2/FNGaLKqNSMKRPpqLpR3+Qe Iu4dsOn5LX6bXxzNuFJde8KZSauNPh6DH23/28lhBbN02SAk+KHECFhTwN68VFQ44UVZ 7mM1+oHK4WBbiAL5Syh36iExN+zKTUzMwF/uzBooAsmoT96Bm2ZBLiBp6RrPaKPIjnVy F4HQZZjpO0gUqvzpmP7h3Dq4xG5O/KdtG7T34wN/pvkEmCLIOZtKDZqZbRAYERqt+NBt ASZg==
X-Gm-Message-State: AOAM531r55+vYY9xb+9R+r95MwQ0U+wlwEF2a0P81xBrhB+vdSKN/QNs hn0ZFkjGwTzKnhIb0uROi1mgtv4RKHAALJnhJxMWklf7
X-Google-Smtp-Source: ABdhPJzJS7zelp3rZC/Ij1wtwzyhU0YXUxrt40nJxLdtIuVFpdKt2X1VVtZDzkrTlVRJmBLEEqwRDdTfULVUvjyr8lI=
X-Received: by 2002:a05:620a:13ee:: with SMTP id h14mr3728253qkl.741.1644145363208; Sun, 06 Feb 2022 03:02:43 -0800 (PST)
MIME-Version: 1.0
References: <> <> <> <>
In-Reply-To: <>
From: Yoshifumi Nishida <>
Date: Sun, 06 Feb 2022 03:02:32 -0800
Message-ID: <>
To: Vidhi Goel <>
Cc: Lars Eggert <>, " Extensions" <>
Content-Type: multipart/alternative; boundary="000000000000554cde05d7576c7d"
Archived-At: <>
Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc8312bis-06.txt
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: TCP Maintenance and Minor Extensions Working Group <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Sun, 06 Feb 2022 11:03:21 -0000

Hi Vidhi,

On Thu, Jan 27, 2022 at 4:35 PM Vidhi Goel <> wrote:

> Also, I am wondering if has
> been solved completely.
> Have we decided to leave this part as it is? We don't need any texts here
> or are there any future plans?
> We have discussed internally and decided to leave it as is. The
> justification is - there is already large scale deployment of CUBIC in
> the field with Beta_cubic = 0.7. We had added the below line to the draft
> as a caution. To change B_cubic for so many deployments, it would require a
> lot of experimental data and perhaps even some deployment experience. Such
> a change would be categorized as a research initiative before it makes it
> to an IETF draft.
> *A side effect of setting βcubic to a value bigger than 0.5 is slower
> convergence. We believe that while a more adaptive setting of βcubic could
> result in faster convergence, it will make the analysis of CUBIC much
> harder.*

OK. I've thought about this and I am fine with this as long as we recommend
using hystart++ or other burst mitigations during slow start (which is
already done)