Re: Fibonaccing CID lengths

Dmitri Tikhonov <dtikhonov@litespeedtech.com> Thu, 23 May 2019 08:21 UTC

Return-Path: <dtikhonov@litespeedtech.com>
X-Original-To: quic@ietfa.amsl.com
Delivered-To: quic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4ECA612016B for <quic@ietfa.amsl.com>; Thu, 23 May 2019 01:21:38 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.901
X-Spam-Level:
X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=litespeedtech-com.20150623.gappssmtp.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 jdlj7_bUs5EM for <quic@ietfa.amsl.com>; Thu, 23 May 2019 01:21:36 -0700 (PDT)
Received: from mail-qt1-x830.google.com (mail-qt1-x830.google.com [IPv6:2607:f8b0:4864:20::830]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AD1A212002F for <quic@ietf.org>; Thu, 23 May 2019 01:21:36 -0700 (PDT)
Received: by mail-qt1-x830.google.com with SMTP id i26so5698234qtr.10 for <quic@ietf.org>; Thu, 23 May 2019 01:21:36 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=litespeedtech-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:mail-followup-to:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=amaTts0EeLB5ZOVBE1CFw6wUn4/hXZ3iUSN8L+1ef/M=; b=HeQf/T4NC0YAceoidV9aOIk95B8VQlc+h/8FOwtV4GPPX2aqylx3hfDvWG1wB1yzC2 BjMJEhw3S72Bw8FKGj23FzBwqYyk6+HkbMZg2jKl1FIcCDE4ie1z9Q0TjAdoXnHFr9ZA 3nRHokr4zqygG5XFie8IFyJiZqb8D/V+l+H+Wz6C06uZrNo3IXYbMZC+HlYbwQfq5AWE 5bCJIG8fpvGM2smvcvPDQqvnhVKW1+U9x6BZ8cYMUmtFO1U8etazs/KqcDGYAs88LKBL e+BVPEV4uNnNYdZKNRfPCTfuZf8EZQjvshisW94IVkmkl6058ZC0meaQ/+SUBO1QaZhW uZ/Q==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id :mail-followup-to:references:mime-version:content-disposition :content-transfer-encoding:in-reply-to:user-agent; bh=amaTts0EeLB5ZOVBE1CFw6wUn4/hXZ3iUSN8L+1ef/M=; b=amXAQu364XSKfBdfZ810tBdw2T1j7mQASeOe2IjFUzvd2No6kBItF8fJzwn6Ag7z1e eg260tyN9bFJHLWGheoYMk7tnxhpIIvNPBl2h2kSfGBpmhxUAPoz40E4XM9Bae1l/Zee JOF8qLOP8BAMku6J7TNOlK/TI4y5zDuok1sAilX52h2xzVV9/R0vjeg9MpjdUEhJJovq p0UyfPcOHIEkIexIqumncg4xgVtop88Diazuodwq3aXSUmTdgTb9yjaFJi8Ki7xROTW/ 4jXbPW21+UlKThNS59/8XjG7u1PwOvWZoNtjySQesKZ9MIrxcKFqZSNFJEFqKpy5PRLU 28Gg==
X-Gm-Message-State: APjAAAVG937E5aTU2ZkMchNAJ3ojCDaMwbd/6Qr0FAGIKbTbWVbC+DCh XIop8EdyxMMHoeRMYqlOFp+XRA==
X-Google-Smtp-Source: APXvYqxx9wkX/eZuUYFgZcafBHQ9yfnOMcYpk3tQ4zMmAK3Kt7npP2eZEP/zD8ozs5ont4VLVheafQ==
X-Received: by 2002:ac8:182e:: with SMTP id q43mr80849789qtj.128.1558599695911; Thu, 23 May 2019 01:21:35 -0700 (PDT)
Received: from ubuntu-dmitri (ool-44c1d219.dyn.optonline.net. [68.193.210.25]) by smtp.gmail.com with ESMTPSA id g124sm475068qkf.55.2019.05.23.01.21.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 23 May 2019 01:21:35 -0700 (PDT)
Date: Thu, 23 May 2019 04:21:30 -0400
From: Dmitri Tikhonov <dtikhonov@litespeedtech.com>
To: Kazuho Oku <kazuhooku@gmail.com>
Cc: Christian Huitema <huitema@huitema.net>, Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>, IETF QUIC WG <quic@ietf.org>
Subject: Re: Fibonaccing CID lengths
Message-ID: <20190523082129.GA6712@ubuntu-dmitri>
Mail-Followup-To: Kazuho Oku <kazuhooku@gmail.com>, Christian Huitema <huitema@huitema.net>, Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>, IETF QUIC WG <quic@ietf.org>
References: <20190522141238.GA23472@ubuntu-dmitri> <CAN1APdfBMeKGzsdLR__OLUHQ7pg=YM76C2Qxn6VDCXu680JQyA@mail.gmail.com> <ab64bdc2-805b-a86d-c525-41d076deac40@huitema.net> <20190522200406.GA28789@ubuntu-dmitri> <CANatvzx4rxk6UU48omk-EfpoYzfg_zWR+N49zMWi_5rv722uQg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CANatvzx4rxk6UU48omk-EfpoYzfg_zWR+N49zMWi_5rv722uQg@mail.gmail.com>
User-Agent: Mutt/1.5.24 (2015-08-30)
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic/qjqHg3bQ70OJW3nrNEZaSRYnqXs>
X-BeenThere: quic@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Main mailing list of the IETF QUIC working group <quic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic>, <mailto:quic-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic/>
List-Post: <mailto:quic@ietf.org>
List-Help: <mailto:quic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic>, <mailto:quic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 23 May 2019 08:21:38 -0000

On Thu, May 23, 2019 at 04:36:54AM +0100, Kazuho Oku wrote:
> 2019年5月22日(水) 21:04 Dmitri Tikhonov <dtikhonov@litespeedtech.com>:
> > While the example is lighthearted, the proposal is serious: that is,
> > remap 0 - 15 values of the nybble to a different set.  Do we need to
> > represent every intermediate number between 0 and 48 (the maximum of
> > the current PR)?
> 
> The question is what you gain by compressing the length to 4 bits.
> 
----- 8< --- 8< --- 8< ---
> 
> So, what's the benefit?

Smaller change to the drafts -- and existing code.

  - Dmitri.