Re: [quicwg/base-drafts] Required state for retaining unacked RETIRE_CONNECTION_ID frames is unbound (#3509)

Kazuho Oku <notifications@github.com> Wed, 01 April 2020 12:30 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 D6F853A0D99 for <quic-issues@ietfa.amsl.com>; Wed, 1 Apr 2020 05:30:55 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.696
X-Spam-Level:
X-Spam-Status: No, score=-1.696 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, DKIM_VALID_EF=-0.1, HTML_IMAGE_ONLY_28=1.404, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, 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 wXRDXBBTd0gs for <quic-issues@ietfa.amsl.com>; Wed, 1 Apr 2020 05:30:54 -0700 (PDT)
Received: from out-21.smtp.github.com (out-21.smtp.github.com [192.30.252.204]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 38D833A0D97 for <quic-issues@ietf.org>; Wed, 1 Apr 2020 05:30:54 -0700 (PDT)
Date: Wed, 01 Apr 2020 05:30:53 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1585744253; bh=jB3DQtX/CwpXs3m6luo6yjD5KQ9+rqATwSHAeXXF114=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=PkYIopqi/0wyxYJVZTuIAoff3+1+gFBhvj3g8af2dt4Oeh1yjurtJP+7ol6gU7Qy5 r3EsX3NEozO8W2aWJjekipK85eXZdydSyzqUxcXAAhheSIE3OR91CVaB2o/f6l5pp8 jAXNr0qY3pzNshQ+wFGXhGeJT0G8r9fJp6GGB27c=
From: Kazuho Oku <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK3I45UMZNRBHRV66BN4SBVHZEVBNHHCFAMG5E@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/3509/607220688@github.com>
In-Reply-To: <quicwg/base-drafts/issues/3509@github.com>
References: <quicwg/base-drafts/issues/3509@github.com>
Subject: Re: [quicwg/base-drafts] Required state for retaining unacked RETIRE_CONNECTION_ID frames is unbound (#3509)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5e84897deb9_47b13fc1360cd9601853c0"; 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/JMiGUwa7VVfGiz81Gyv1FRpDvkw>
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: Wed, 01 Apr 2020 12:30:56 -0000

@marten-seemann 
> My fear regarding #3547 is that no matter how high we choose the limit, there will always be a loss pattern that will trigger a protocol violation.

Thank you for raising the concern, I think the recommended behavior when exceeding that limit is to stop sending RCID frames for some sequence numbers rather than triggering a protocol violation. That's actually what I had in mind hence called it "leaky."

The benefit of stopping retiring some sequence numbers is that the worst case becomes endpoints running out of CIDs - something that is expected to happen on ordinary connections too. Note also that in HTTP/3, reestablishing a connection in 0-RTT is always a viable option.

To summarize, I think that the concern can be resolved for HTTP/3 by changing the recommended behavior from resetting the connection to stop sending RCIF frames for some sequence numbers.

-- 
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/3509#issuecomment-607220688