IETF Logo Mail Archive

Re: Reducing the battery impact of ND

Lorenzo Colitti <lorenzo@google.com> Thu, 30 January 2014 18:39 UTC

Return-Path: <lorenzo@google.com>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1378A1A0072 for <ipv6@ietfa.amsl.com>; Thu, 30 Jan 2014 10:39:16 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.913
X-Spam-Level:
X-Spam-Status: No, score=-1.913 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.535, SPF_PASS=-0.001] autolearn=ham
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 bpyqqhvUKNMT for <ipv6@ietfa.amsl.com>; Thu, 30 Jan 2014 10:39:14 -0800 (PST)
Received: from mail-ie0-x234.google.com (mail-ie0-x234.google.com [IPv6:2607:f8b0:4001:c03::234]) by ietfa.amsl.com (Postfix) with ESMTP id 3B0811A0292 for <ipv6@ietf.org>; Thu, 30 Jan 2014 10:39:14 -0800 (PST)
Received: by mail-ie0-f180.google.com with SMTP id at1so3672166iec.11 for <ipv6@ietf.org>; Thu, 30 Jan 2014 10:39:10 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=g8dPkVpnZrqyJC4FXmaWg9N7hFAyOK0AvCt/l31EcB4=; b=YLe//pGLSZJq6/lmwnP7NX8wtdqGf2Dlcimp+ULmKPXeVFR68WTuqSm+W2MgcH9a3l rSfpiwfIedeyYQEy3WVQv9ZgDbdzJyUT6uMI3zZgjnvBhtXZ0o149gINw7MJF+ukV9FX TP9+/jlvCXfhQz0ENxxd3qOis4p9BlNrWs7+twnhrMlEUxnPgAMGl6/8qIcq3y6+dPlp fuCRTk+QAL20kxRzUhlirPHqsr99KGA5fcVDcvKB7qhTn83SYAPgbEKQ1eiR0FvxYAAZ +Q+badjcOpKmiytjagjLXEwQDy3H0fJJX6KgPYNKI2R2OmcinVWDrL9w7kzfQRGsghr5 4HZw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=g8dPkVpnZrqyJC4FXmaWg9N7hFAyOK0AvCt/l31EcB4=; b=ZEpmePg5YHAaAQJ9Or9bCjbMDk0MfrG0CXW+j5bfPnOh4Ig3kHYQSlFXtaOegNflWR a421e9ytvnUDJi/xcAtxAVXfzOB3DYJzfuc6E7ADyfzhxZ5DQ02oiQ2Zo/xBvRSqq2zt 3w0LVJtQc6VXi3/N7gH7JY+RRmBnoXas4PF/6eJfvgBT2sXmld3F7sph7Tz0RpgkBw0K QwfVSGnaPJpkJiiMgp7S9uCzX5WS9XmDa5fOcIvTbAVr66RSGd+fTR+JV16/ykpMcisb sxgQWpQeokPO+f2sWvG+/7rCb3JqCM1Z+Ere7rsf9ymj39+/O1ibiAVPAIHsc7G993A2 wTDQ==
X-Gm-Message-State: ALoCoQkyTbzjEBGqKq3SB3IOgEhF9AYwhaxBe81KbOPVhdGCzSsEVH3ukmN1YzBVupcbyKDXIWEol3XHCBwn4QmaznvfzxJlT+00aSmWAjcp7egLF+8T2TPB87vqz04nZrCvGvqbdyDDAlU1cRs3FelX+f5SSueIow7rPqohAqKZh0v66b7K7Qsx0UxcXK9+j+Lzpf0dIPfl
X-Received: by 10.42.246.131 with SMTP id ly3mr12093763icb.8.1391107150629; Thu, 30 Jan 2014 10:39:10 -0800 (PST)
MIME-Version: 1.0
Received: by 10.64.7.36 with HTTP; Thu, 30 Jan 2014 10:38:50 -0800 (PST)
In-Reply-To: <52E9EF2D.9050402@acm.org>
References: <CAKD1Yr29S=O5L4DfhNoiVieWPkgBJ2veuOu6ig5rwgK4ELz7Xw@mail.gmail.com> <52D96663.6060005@sonic.net> <CAKD1Yr3pCQ15uFz36MvKG3Q_Vzt27ws0aG1=94377FFaJtWV7g@mail.gmail.com> <52DA0ABA.8030903@acm.org> <CAKD1Yr1zSfAOv8j9XgB_ph9uaUUNW0yrJhfjJTsSTYHNKYNx9A@mail.gmail.com> <52E03BB4.8040309@acm.org> <DCA1F00D-0775-4030-A3BF-700F01F98C35@employees.org> <52E0423A.5070906@acm.org> <01DC3532-C73A-4644-A323-04BE6231AADA@employees.org> <52E9EF2D.9050402@acm.org>
From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 30 Jan 2014 10:38:50 -0800
Message-ID: <CAKD1Yr2RDNqL8ERr+5t7MUY7c2S_YneNYX4Pt4z+T0yHWM10bg@mail.gmail.com>
Subject: Re: Reducing the battery impact of ND
To: Erik Nordmark <nordmark@acm.org>
Content-Type: multipart/alternative; boundary="90e6ba6e87108ef8ed04f1345fd2"
Cc: 6man Chairs <6man-chairs@tools.ietf.org>, Andrew Yourtchenko <ayourtch@gmail.com>, 6man WG <ipv6@ietf.org>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ipv6/>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 30 Jan 2014 18:39:16 -0000

On Wed, Jan 29, 2014 at 10:20 PM, Erik Nordmark <nordmark@acm.org> wrote:

> The frustrating thing is that the same folks that argue that the WG
> shouldn't work on a different design (targeting multicast challenged
> links), keep on suggesting tweaks. If the WG thinks we should work on
> improving ND for such links (and perhaps also improve it for battery
> operated hosts), then let's do that work. If not, then let's stop
> suggesting tweaks.
>

What tweaks are we talking about? The major change that's being suggested
here is to increase the robustness of initial attach by changing "try three
times and then give up" to "exponential backoff". I don't think anyone
disagrees with that, right?

As for unicast RAs, that's an operational issue. The specs allow it, and as
Ole says, before going and changing the specs, we should hear (perhaps from
v6ops?) that this is a real-world problem, and that changing the specs is
the only or best way to fix that problem.

v2.23.0 | Report a Bug | By Email