19 Jun
2000
19 Jun
'00
3:44 a.m.
Bora Akyol <akyol@akyol.org> wrote:
What is the big, clear advantage of supporting jumbo frames?
There are none, not without doing something about TCP congestion control. The bigger frames are, the more coarse the congestion control is, and the flows are short enough on average to make it barely effectual. Increasing frame size to 10kb makes most flows "mice" flows, which kills the slow-start algorithm. Of course, flows may start by sending smaller frames first, but, again, what's the point? With 1500 byte frames, the framing overhead is about 2.8%, however, given that the 40% of packets are only 40-41 bytes long, this seems to be a very minor effect. --vadim