Leo Bicknell wrote:
I just have to speek up that this is all very well and good, but it's also a good way to make a NAP that doesn't work. [...] If you don't, the behavior is simple. A 9k MTU GigE arps for a 1500 byte FastEthernet host. Life is good. The TCP handshake completes, life is good. TCP starts to send a packet, putting a
Furthermore... Larger frames would be nice if all hosts supported them, but the problem is that the that most end hosts cannot and probably will not ever support so called jumbo frames. What does having 9K ethernet frame support at a NAP get us? If one end of the connection, all those 1500 MTU end hosts, don't support large frames fragmentation may have to occur somewhere and that would probably be worse. With fragmentation, the performance problem is pushed closer out to the edge and the edge is probably where the performance benefit is needed so it could be a step in the wrong direction. Perhaps the one good approach to jumbo frames is to make use of the networking layer and ensure hosts are doing Path MTU discovery to avoid fragmentation. John