Re: [quicwg/base-drafts] Ignoring ACK delay can result in wrong RTT calculations (#3350)

mirjak <notifications@github.com> Thu, 23 January 2020 09:42 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6AA6A12020A for <quic-issues@ietfa.amsl.com>; Thu, 23 Jan 2020 01:42:21 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.454
X-Spam-Level:
X-Spam-Status: No, score=-6.454 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_20=1.546, 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: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Rg4NA3nhDhER for <quic-issues@ietfa.amsl.com>; Thu, 23 Jan 2020 01:42:20 -0800 (PST)
Received: from out-7.smtp.github.com (out-7.smtp.github.com [192.30.252.198]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EADC012001E for <quic-issues@ietf.org>; Thu, 23 Jan 2020 01:42:19 -0800 (PST)
Date: Thu, 23 Jan 2020 01:42:19 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1579772539; bh=vDMhTv1HK+wJ7obP6/EB1PQKSv61fZgxI74NTyN2EnE=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=BJfXznGYE0zmRVaC47OcWh6CZ7ebMLh5D1uuOjVH1RiHLEJzhEqY0qq3Uhsxom+Yh UGGLTB149HrcsqcWtcXX2FXlvRNZ2Rdc/d8Ci4/ucqb5O/SUGM+Bl4/5JO+cRmeEJf 1USkGiE+owz3rxAjtJ5Sv0eckoUW428gfGIDGhao=
From: mirjak <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK6NIPTTXXD4HB452KV4G2OPXEVBNHHCBTTN5I@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/3350/577603355@github.com>
In-Reply-To: <quicwg/base-drafts/issues/3350@github.com>
References: <quicwg/base-drafts/issues/3350@github.com>
Subject: Re: [quicwg/base-drafts] Ignoring ACK delay can result in wrong RTT calculations (#3350)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5e296a7b1614b_9183fbce7ecd964466f5"; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: mirjak
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/x9WNDNA1yQhoElOGRutYCgDTMbk>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 23 Jan 2020 09:42:22 -0000

The other option would be to not update smoothed_rtt at all... but the we need a way to ensure that we update still frequently enough.

Also the code should probably say at least (adding =):

if (latest_rtt => min_rtt + ack_delay):

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/3350#issuecomment-577603355