Re: [PATCH net-next v2 0/9] xsk: improvement performance in copy mode

On Tue, Aug 26, 2025 at 9:15 AM Jakub Kicinski [off-list ref] wrote:

On Tue, 26 Aug 2025 08:51:24 +0800 Jason Xing wrote:

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Sorry for missing the question. I'm not very familiar with how to run the
test based on AF_PACKET. Could you point it out for me? Thanks.

I remember the very initial version of AF_XDP was pure AF_PACKET. So
may I ask why we expect to see the comparison between them?

Pretty sure I told you this at least twice but the point of AF_XDP
is the ZC mode. Without a comparison to AF_PACKET which has similar
functionality optimizing AF_XDP copy mode seems unjustified.

Oh, I see. Let me confirm again that you expect to see a demo like the
copy mode of AF_PACKET v4 [1] and see the differences in performance,
right?

If AF_PACKET eventually outperforms AF_XDP, do we need to reinvent the
copy mode based on AF_PACKET?

And if a quick/simple implementation is based on AF_PACKET, it
shouldn't be that easy to use the same benchmark to see which one is
better. That means inventing a new unified benchmark tool is
necessary?

To be honest I suspect you can get an LLM to convert your AF_XDP test
to use AF_PACKET..

Okay, allow me to spend more time on af_packet before getting my hands
dirty... Converting xdpsock should not be that easy, I feel... But I
will give it a try first.

Thanks,
Jason