Re: [quicwg/base-drafts] Lost Server Initial Takes Too Long to be Retransmitted (#3078)

Kazuho Oku <notifications@github.com> Mon, 07 October 2019 02:03 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 415881207FC for <quic-issues@ietfa.amsl.com>; Sun, 6 Oct 2019 19:03:40 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.597
X-Spam-Level:
X-Spam-Status: No, score=-6.597 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, RCVD_IN_MSPIKE_H2=-0.001, 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 q4dIMrcgEKKP for <quic-issues@ietfa.amsl.com>; Sun, 6 Oct 2019 19:03:38 -0700 (PDT)
Received: from out-3.smtp.github.com (out-3.smtp.github.com [192.30.252.194]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 77F3912001E for <quic-issues@ietf.org>; Sun, 6 Oct 2019 19:03:38 -0700 (PDT)
Date: Sun, 06 Oct 2019 19:03:37 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1570413817; bh=YLY1bu1JqpXPiGc/UlqaImJuuasaaKbI8a8hfF3z094=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=JmAek9x1JFvnejAKCSHpJ5JPmWOuiIaExyM+BAR3epP+1fOeU7JXVu+/N/M0cjxTK c8wkBMks4Mq6xdmRvW8VtwZl2FaExzSdgCT1JCwGtifvcU/oVCq+Kn6B0ea1Z2iZJ8 pTIvXSXa4Y/sYivaSBNLS9ujhULnQeFQ3PeiDI7A=
From: Kazuho Oku <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJKY7GBD7LT7MFOYGZFN3U7HXTEVBNHHB34LR2Y@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/3078/538815280@github.com>
In-Reply-To: <quicwg/base-drafts/issues/3078@github.com>
References: <quicwg/base-drafts/issues/3078@github.com>
Subject: Re: [quicwg/base-drafts] Lost Server Initial Takes Too Long to be Retransmitted (#3078)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5d9a9cf995937_15443fddaf8cd968211979"; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: kazuho
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/0bv8fV-OSw_6gxE5iVcXn7LUSoo>
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: Mon, 07 Oct 2019 02:03:40 -0000

I think the problems here are:
* Receiving a retransmit client Initial does not necessarily indicate a loss. It could simply be the case that the actual RTT is greater than the client's initial RTT. Do we want the server to retransmit packets in that case? Note that a client might use a small initial RTT when it is connecting to a server that it has previously connected to.
* How the server detects a retransmission will become complicated if we adopt #3045.

Considering these aspects, I might be weakly inclined to addressing the issue using an explicit signal, defined either within v1 or an extension.

-- 
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/3078#issuecomment-538815280