actually, 1500 byte frames require a very different buffering technique, since 
you have so many in flight at a given time.
if your old enough, this equates to the 53byte ATM cells when the data rates 
were in the Megabit range.


manning
bmann...@karoshi.com
PO Box 12317
Marina del Rey, CA 90295
310.322.8102



On 27June2015Saturday, at 15:58, Stephen Satchell <l...@satchell.net> wrote:

> On 06/27/2015 11:48 AM, manning wrote:
>> This is kind of like asking when we will stop using ethernet framing
>> (ethernet was designed for a 3Mbps transmission rate) yet we are
>> deploying 100Gbps networks.  Still stuck on that 1500byte limitation.
>> When can we get rid of that?
> 
> Speed has nothing to do with frame size.  The 1500 byte limitation is more a 
> function of the CRC algorithm.  (Oh, the initial frame size was selected for 
> 3-mbit Ethernet so that collision mitigation was reasonable.)
> 
> Think about jumbo frames (9000 bytes) and their robust error detection.  
> Research is being done in even larger frames, because the rule is that as 
> your transmission rate increases, you should increase the frame size and use 
> a FRC algorithm that detects all one-bit errors and most two-bit errors, at 
> least.

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