There is a reason why MTU's are generally small. In early internet there was a clash (IMO unsettled) between fixed-packet-length and dynamic-packet-length netw

There is a reason why MTU's are generally small. In early internet there was a clash (IMO unsettled) between fixed-packet-length and dynamic-packet-length networks. Compare ethernet to ATM. The benefit of ATM is bandwidth guarantees. You can precisely allocate bandwidth to each tenant. With ethernet you don't have such guarantees. Single tenant can potentially use all the resources. If you allowed jumbo frames in early slow ethernet, you could totally imagine one tenant blocking the line for a-very-long-time, and starving everyone else. Of course, times had changed, bandwidth shot up, and 1500 is indeed way to small. But there is still a limit. You probably don't want to allow gigantic 1.5MiB frames. Normal jumbo frames of 9KiB are fine. It's just a historical accident they aren't made more popular.