Re: [quicwg/base-drafts] Reduce restrictions on valid RTT samples (#2568)

Jana Iyengar <> Mon, 08 April 2019 22:14 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 252FE1200C7 for <>; Mon, 8 Apr 2019 15:14:43 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -8.001
X-Spam-Status: No, score=-8.001 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_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 MNqHlFMh8eFy for <>; Mon, 8 Apr 2019 15:14:41 -0700 (PDT)
Received: from ( []) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by (Postfix) with ESMTPS id D4DDD120362 for <>; Mon, 8 Apr 2019 15:14:39 -0700 (PDT)
Date: Mon, 08 Apr 2019 15:14:38 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=pf2014; t=1554761678; bh=D0sqiA6c2VvOTWB305uAdFLlv9anSWd8OjKpDecPdHc=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=HOoJIVe23NTvW4OZaZDP8+IKT55mTLNMJGmq6x1DKGYSLS9kSdI275P0LCijej2h4 6Az/W7EeFwrGW+OUe/9HVIuy6vk0owAr3TdT3vIp+/4QwX0Pe89cYFQ7iO5z5faXUm I7ae0I9of2vJcPt1+Kcjq56E1npDYXcpBDj4gFQ0=
From: Jana Iyengar <>
Reply-To: quicwg/base-drafts <>
To: quicwg/base-drafts <>
Cc: Subscribed <>
Message-ID: <quicwg/base-drafts/issues/2568/>
In-Reply-To: <quicwg/base-drafts/issues/>
References: <quicwg/base-drafts/issues/>
Subject: Re: [quicwg/base-drafts] Reduce restrictions on valid RTT samples (#2568)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5cabc7cee1ad4_65b13fc64ecd45c0141913"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: janaiyengar
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: Mon, 08 Apr 2019 22:14:43 -0000

@marten-seemann: I agree with @nibanks that tracking non-ack-eliciting packets shouldn't be much additional load, but I don't think that's necessary.

If an ACK acknowledges packets that you don't know about, they've been acked or they're non-ack-eliciting. Either ways, this ACK should not generate a valid RTT sample.

I'll also note that you are not required to use every ACK that acks any ack-eliciting packets for an RTT sample.  If you're not tracking a packet, you can't use it's ack for an RTT measurement.  Ignoring these ACKs is the only way forward, and the text will allow that.

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