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John,
Here's the presentation from Al Braga, UNH
IOL:
Kevin Daines
From: John DAmbrosia [mailto:jdambrosia@xxxxxxxxxxxxxxxxxxx] Sent: Thursday, August 10, 2006 2:46 PM To: Kevin Daines; STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx Subject: RE: [HSSG] Jumbo frames Kevin, Out of curiosity, I
assume during 802.3as you were looking at the entire Ethernet family, including
Fast Ethernet, Gigabit Ethernet, and 10 Gigabit. Was there any sort of
breakdown of support for jumbo frames shown per speed that you could
share? Thanks! John From: Kevin
Daines [mailto:Kevin.Daines@xxxxxxx] All, Joel's statement below can be
grossly misinterpreted. He states that all system and silicon vendor supports
jumbo frames. That may be true but I highly doubt it. However, what is not
true is that all or the even the majority of the installed base of Ethernet gear
supports jumbo frames. In addition, many products on the market today do not
support jumbo frames (by products I mean both equipment and silicon). During the
P802.3as Frame Expansion project (soon to complete), UNH IOL kindly tested
hundreds of pieces of gear and combed through hundreds of reports to determine
the maximum frame size supported by Ethernet gear (that had been submitted to
UNH). While not exhaustive, the data indicated a wide range of maximums from
1515 (not a typo) through 2K, 4K, 5K, and 9K and
beyond. Within P802.3as, we discussed jumbo
frames at various times. The following constitutes my recollection of the
reasons against "standardizing jumbo frames" (not
ordered): 1) Interoperability with legacy
gear 2) Increasing frame size is a
slippery slope. Why 9KB? Why not something larger, like 16KB or
64KB? 3) The network performance
bottlenecks change over time. Each major component of the network/system goes
through improvements and upgrades, which changes the requirements on other parts
of the network/system. 4) QoS (frame delay, frame delay
variation, etc.) impacts Kevin
Daines Chair, P802.3as
TF Note from archive attached
below:
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