Re: [quicwg/base-drafts] Add note about frequent RTT estimates (#2340)

Martin Thomson <> Tue, 22 January 2019 23:50 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 01E521311A2 for <>; Tue, 22 Jan 2019 15:50:38 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -11.149
X-Spam-Status: No, score=-11.149 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-4.553, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_28=1.404, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (1024-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id MRp922Nv1Bh3 for <>; Tue, 22 Jan 2019 15:50:35 -0800 (PST)
Received: from ( []) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by (Postfix) with ESMTPS id 5E646130F3A for <>; Tue, 22 Jan 2019 15:50:35 -0800 (PST)
Date: Tue, 22 Jan 2019 15:50:34 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=pf2014; t=1548201034; bh=LG4V2byAV/W/5NsB5DfblTZnkrV2UpLIJRbibsK3R4M=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=iTKmt8yZXOaAjmBfEEviql3erB+PwM0dmYQFj35Ok0fDqheFCksOj3KP7tNg6QgXP HT2yQXvw00BBNoVru+rGh+XD2uc/vqFQ3oM0bQ4InD8obSmeV68VxbOlWDUp4QN3iC d8pdWeaAwn8EoC2Ovvz9qW/MqduRFqq5JAFzeAoo=
From: Martin Thomson <>
Reply-To: quicwg/base-drafts <>
To: quicwg/base-drafts <>
Cc: Subscribed <>
Message-ID: <quicwg/base-drafts/pull/2340/review/>
In-Reply-To: <quicwg/base-drafts/pull/>
References: <quicwg/base-drafts/pull/>
Subject: Re: [quicwg/base-drafts] Add note about frequent RTT estimates (#2340)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5c47ac4a87b8f_54c83f8ae10d45c0808b1"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: martinthomson
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
Archived-At: <>
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Tue, 22 Jan 2019 23:50:38 -0000

martinthomson commented on this pull request.

> @@ -289,8 +289,15 @@ be subtracted from the RTT as long as the result is larger than the min_rtt.
 If the result is smaller than the min_rtt, the RTT should be used, but the
 ack delay field should be ignored.
-Like TCP, QUIC calculates both smoothed RTT and RTT variance similar to those
-specified in {{?RFC6298}}.
+A sender calculates both smoothed RTT and RTT variance similar to those
+specified in {{?RFC6298}}, see {{on-ack-received}}.
+A sender might take multiple samples per RTT because ACK frames that are

A sender will take multiple samples per RTT.  RTT samples are taken when the largest acknowledged packet number is increased by an acknowledgment (see).

You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub: