From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Date: Fri, 28 Feb 2020 09:30:56 -0500

Can you contrast this against a run with your changes? The thought is
that the majority of this cost is due to the memory loads and stores, not
the arithmetic ops to compute the checksum. When enabling checksum
offload, the same stalls will occur, but will simply be attributed to
memcpy instead of to do_csum.

Agreed.