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.
