Re: [quicwg/base-drafts] MUST pace or limit bursts to 10 packets (#3106)

Martin Thomson <> Fri, 25 October 2019 07:57 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 75442120145 for <>; Fri, 25 Oct 2019 00:57:39 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -6.596
X-Spam-Status: No, score=-6.596 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_HELO_NONE=0.001, 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 1-yW9HBZyICh for <>; Fri, 25 Oct 2019 00:57:37 -0700 (PDT)
Received: from ( []) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by (Postfix) with ESMTPS id BFA2E12012A for <>; Fri, 25 Oct 2019 00:57:37 -0700 (PDT)
Date: Fri, 25 Oct 2019 00:57:36 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=pf2014; t=1571990256; bh=Pi8hjbQAg1Z79bFSN54YzV80T2x2Ez1ZMougTGAFS3s=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=WL92LALnMPE803e1/AIdxtI0mXyY44KT0CXCuNQHI7qj8h0lpPq5Vc3QiA3idD0jN YZVfD2LhrRuhF8brsjX83Iq4aKLvMQMGMhSq+qBbOPfYUjTOq5lcTsDmAp3OR7lNpq zSyeOGUYGwkmPj/SopdYw+GBJTq3XDg2+SrS0nmc=
From: Martin Thomson <>
Reply-To: quicwg/base-drafts <>
To: quicwg/base-drafts <>
Cc: Subscribed <>
Message-ID: <quicwg/base-drafts/pull/3106/review/>
In-Reply-To: <quicwg/base-drafts/pull/>
References: <quicwg/base-drafts/pull/>
Subject: Re: [quicwg/base-drafts] MUST pace or limit bursts to 10 packets (#3106)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5db2aaf0cf939_4fcb3fdd244cd95c516db"; 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: Fri, 25 Oct 2019 07:57:39 -0000

martinthomson commented on this pull request.

> @@ -753,6 +753,12 @@ delivery of ACK frames is important for efficient loss recovery. Packets
 containing only ACK frames should therefore not be paced, to avoid delaying
 their delivery to the peer.
+Sending multiple packets into the network without any delay between them
+creates a packet burst that might cause short-term congestion and losses.
+Implementations MUST either use pacing or limit such bursts to minimum
+of 10 * kMaxDatagramSize and max(2* kMaxDatagramSize, 14720)), the same
+as the recommended initial congestion window.

Or you could say that there are different initial window and burst limits, which is probably OK.  I don't think that we need to be that smart though.

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