On Tue, 15 Jun 2021 at 15:29, Bin Meng [off-list ref] wrote:

...
Yes, Gary Guo sent one patch long time ago against the broken assembly
version, but that patch was still not applied as of today.
https://patchwork.kernel.org/project/linux-riscv/patch/20210216225555.4976-1-gary@garyguo.net/

I suggest Matteo re-test using Gary's version.

That's a good idea, but if you read the replies to Gary's original patch
https://lore.kernel.org/linux-riscv/20210216225555.4976-1-gary@garyguo.net/ (local)
.. both Gary, Palmer and David would rather like a C-based version.
This is one attempt at providing that.

quoted

I'm surprised IP_NET_ALIGN isn't set to 2 to try to
avoid all these misaligned copies in the network stack.
Although avoiding 8n+4 aligned data is rather harder.

Misaligned copies are just best avoided - really even on x86.
The 'real fun' is when the access crosses TLB boundaries.

Regards,
Bin