[802.3EEESG] FWD: [802.1 - 2943] Fwd: Energy Efficient Ethernet and 802.1
Forwarding Dan's original message - I didn't realize it wasn't in the
message I forwarded earlier.
-----Original Message-----
On Behalf Of Romascanu, Dan (Dan)
Sent: Tuesday, July 10, 2007 1:40 AM
To: STDS-802-1-L@listserv.ieee.org
Subject: Re: [802.1 - 2943] Fwd: Energy Efficient Ethernet and 802.1
IEEE 802.1 ballots: P802.1AR due July 9, P802.1ah July 10, P802.1af July
17
Without having much more information about this proposed work than what
is included in this mail, I am surprised to see no mention of the
implications on management. I am not sure what this paragraph exactly
means:
> The concepts behind EEE are that the link speed is reduced during
>periods of low link utilization and that the speed changes remain
>transparent to upper layer protocols.
This change cannot be transparent for the management protocols. How is a
change of speed and mode reported? Is this done before the switching
time? If yes, the question is whether the proposed 1 msec time is enough
to send a fully formatted SNMP notification.
Maybe those questions were already discussed. I will try to attend the
tutorial session to learn more.
In general it is not clear to me in general how IEEE 802.3 intents to
continue the development of MIB support for Ethernet technology, now
that the Ethernet MIB development activity is being terminated in the
IETF, but this is probably a subject for a broader discussion.
Dan
> -----Original Message-----
> From: IEEE 802.1 list HELP only
> [mailto:hdk-105.xtvbd_h22q10g@ATT.NET] On Behalf Of Tony Jeffree
> Sent: Monday, July 09, 2007 11:50 PM
> To: STDS-802-1-L@listserv.ieee.org
> Subject: [802.1 - 2927] Fwd: Energy Efficient Ethernet and 802.1
>
> IEEE 802.1 ballots: P802.1AR due July 9, P802.1ah July 10, P802.1af
> July 17
>
>
> F.Y.I.
>
> Regards,
> Tony
>
> >Envelope-to: tony@jeffree.co.uk
> >X-Ironport-SBRS: None
> >X-Brightmail-Tracker: AAAAAA==
> >X-BrightmailFiltered: true
> >X-IronPort-AV: E=Sophos;i="4.16,487,1175497200";
> > d="scan'208";a="43791020"
> >Date: Mon, 02 Jul 2007 09:48:59 -0700
> >From: Mike Bennett <mjbennett@lbl.gov>
> >Reply-To: mjbennett@lbl.gov
> >User-Agent: Thunderbird 1.5.0.12 (Windows/20070509)
> >To: tony@jeffree.co.uk, Mikejt@broadcom.com
> >CC: "Grow, Bob" <bob.grow@intel.com>
> >Subject: Energy Efficient Ethernet and 802.1
> >X-Envelope-To: tony@jeffree.co.uk
> >X-claradeliver-Version: 4.22.20
> >X-RCPT: tony
> >
> >Dear Tony and Mike,
> >
> >I'm writing to call your attention to work we are doing in
> the Energy
> >Efficient Ethernet (EEE) Study Group whose PAR and 5 Criteria are
> >proposed for approval during the July Plenary.
> >
> >The project, if approved, will likely impact your work and
> require some
> >supporting work from 802.1. The concepts behind EEE are
> that the link
> >speed is reduced during periods of low link utilization and that the
> >speed changes remain transparent to upper layer protocols. The
> >objectives, PAR and 5 criteria are available at
> >http://grouper.ieee.org/groups/802/3/eee_study/index.html.
> >
> >The time required to change speeds is known as transition
> time and is a
> >key point of focus in our work. We have not selected the value for
> >transition time, but the discussion has been around 1 msec. The
> >expertise of 802.1 would be particularly helpful in finalizing the
> >required value for this parameter. There have been two
> methods studied
> >for making the speed change, Rapid PHY Selection (RPS) and
> Subset PHY.
> >
> >The details of these are available on our website
> >http://grouper.ieee.org/groups/802/3/eee_study/public/index.h
tml but at
>a high level, RPS (see:
>http://grouper.ieee.org/groups/802/3/eee_study/public/jan07/christensen
>_01_0107.pdf)
>
>is simply changing speeds as quickly as possible and a Subset PHY
>(see:
>http://grouper.ieee.org/groups/802/3/eee_study/public/may07/woodruff_1_
>0507.pdf) is best described by example: 10GBASE-T PHY operating in a 1
>Gb/s mode.
>Initial experiments suggest that the transition time using RPS would be
>in the low 10s of milliseconds or less, and studies of the Subset PHY
>suggest transition time in the order of microseconds is possible.
>
>The areas that we believe are of interest to you would be:
>
> - Whether an addition to the service interface for some sort of
> indication of traffic backlog would be appropriate.
> - Whether AVB would need to provide some sort of explicit signaling
> to EEE to (a) indicate that a streaming application was starting or
> finished and (b) to keep speed from shifting (and thus inducing large
> jitter and delay variations) during a streaming application session.
> - A secure protocol/packet to allow a DTE to shift to the ultimate
> power saving state (i.e. OFF) as well as a re-ignition command (which
> could possibly be targeted to the first switch instead of the DTE
> itself).
>
>In addition to raising awareness, we would appreciate your feedback and
>recommendations regarding any architecture changes and protocols
>necessary to implement our goals. I strongly encourage early
>participation by your groups as we hope to begin serious work on
>solution in September. We will give a tutorial at the July meeting on
>Tuesday at 6:30 PM. I would appreciate you announcing this in your
>meetings and I look forward to hearing from you.
>
>Best Regards,
>
>Mike
>
>--
>Michael J. Bennett
>Chair, IEEE 802.3 Energy Efficient Ethernet Study Group Tel.
>510.486.7913
>
>
>
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