RE: Jumbo Frames in 10GbE?

["Gerhold, Mark" <Mark.Gerhold@xxxxxxxxxx>]

And here's the URL for the IETF Jumbo Frames draft.  

Jumbo frames has been a longstanding discussion in 802.3.  I must admit to
some bias on this subject, as an server manufacturer.  Servers care about
data-mover applications such as FTP.  For these, per-packet processing is a
key component to performance.  If you double the packet size, you almost
double the performance.  

Mark 
-----Original Message-----
From: Internet-Drafts@xxxxxxxx [mailto:Internet-Drafts@xxxxxxxx]
Sent: Tuesday, June 15, 1999 9:19 AM
Subject: I-D ACTION:draft-kaplan-isis-ext-eth-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.


	Title		: Extended Ethernet Frame Size Support
	Author(s)	: M. O'Dell, J. Kaplan, J. Hayes, T. Schroeder, 
                          P. Singh,  J. Hsu
	Filename	: draft-kaplan-isis-ext-eth-00.txt
	Pages		: 
	Date		: 14-Jun-99
	
This document presents an extension to current Ethernet Frame 
standards to support payloads greater than 1500 Bytes for Ethernet_II
and 802.3 frames. This is useful for Gigabit Ethernet technology, 
providing a means to carry large MTU packets without fragmentation 
over a high-speed broadcast network.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-kaplan-isis-ext-eth-00.txt

Internet-Drafts are also available by anonymous FTP. Login with the username
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	"get draft-kaplan-isis-ext-eth-00.txt".

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-----Original Message-----
From: gwinn@xxxxxxxxxx [mailto:gwinn@xxxxxxxxxx]
Sent: Monday, June 21, 1999 3:39 PM
To: Booth, Brad
Cc: HSSG_reflector (E-mail)
Subject: Jumbo Frames in 10GbE?



At 4:24 PM 99/6/17, Booth, Brad wrote:
>Just a small point.  One of the objectives that passed with greater than
>75% in Coeur d'Alene was to "preserve minimum and maximum FrameSize of
>current 802.3 Std."

I don't know that the issue is going to stay decided all that long, based
on the recent article "Jumbo Frames gather support" (Jeff Caruso, Network
World, 14 June 1999, page 6), which states that IETF has published a
working document proposing that ethernet frames be made larger than the
current 1,500-byte maximum, the basic rationale being to reduce the packet
rate and thus load on packet-handling components of the system.  In short,
this is a system issue, and cannot really be decided solely at the MAC
level.

If jumbo frames are to come, 10GbE would be a logical place to start.

The issue will ultimately be decided by an IEEE Ballot Group, not a
Plenary.  If the market is really going to bigger packets, as this article
implies, it will be hard to resist.

Joe Gwinn



The above is in response to the following:

>        >Issues 3 - Bit Error Rate
>        >The assumption will be that this is 10-12. If someone wishes to
>challenge
>        >this they should bring a presentation to the next meeting
providing
>        detailed reasoning why this needs to change.
>
>        It strikes me that the issue of larger maximum packet sizes will
likely
>        come up, just as it did for GbE.  If 10GbE goes to 9 KB packets,
>the design
>        center BER would need to go to 10^-13 to maintain the same
theoretical
>        packet loss rate.   I'm not sure how much effect this would have in
>        practice, as most gigabit links achieve much better than 10^-12,
>if they
>        work at all.  Anyway, these items are ripe for debate and decision.

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