My point wasn't that you should rely on the weak checksum, but rather that the possibility for failure is already baked in even for such a small set of fields, because errors of any kind can happen at any point even in the simplest setups.

The statement

    With adjustments to ring buffers, IRQ/core affinity, and receive buffer size, you can receive a saturated 40GbE stream with no packet loss.

_Probably_ works out _most_ of the time in physical setups (especially in server environments with strict ECC memory), but it's not something you can write a protocol around if you need all of that data to _actually_ arrive.