Re: [RFC 00/12] io_uring zerocopy send

[Pavel Begunkov]

On 12/1/21 17:57, David Ahern wrote:
> On 12/1/21 8:32 AM, Pavel Begunkov wrote:
[...]
> > > mileage varies quite a bit.
> >
> > Interesting, any brief notes on the setup and the results? Dummy
>
> VM on Chromebook. I just cloned your repos, built, install and test. As
> mentioned above, the skb_orphan_frags_rx change is missing from your
> repo and that is the key to your reported performance gains.

Just to clear misunderstandings if any, all the numbers in the
cover-letter were measured on the same kernel and during the same
boot, and it doesn't include the skb_orphan_frags_rx() change.
All double checked by looking at the traces.

When it's routed through the loopback paths (e.g. -D 127.0.0.1),
it's indeed slow for both msg_zerocopy and send-zc, and both
"benefit" in raw throughput from the hack.

--
Pavel Begunkov