Re: [PATCH v1 2/3] io: Add zerocopy and errqueue

[Leonardo Bras Soares Passos]

On Tue, Sep 7, 2021 at 8:06 AM Dr. David Alan Gilbert
<dgilbert@redhat.com> wrote:
> > Possibly, yes. This really need David G's input since he understands
> > the code in way more detail than me.
>
> Hmm I'm not entirely sure why we have the sync after each iteration;
> the case I can think of is if we're doing async sending, we could have
> two versions of the same page in flight (one from each iteration) -
> you'd want those to get there in the right order.
>
> Dave

Well, that's the thing: as we don't copy the buffer in MSG_ZEROCOPY,  we will in
fact have the same page in flight twice, instead of two versions,
given the buffer is
sent as it is during transmission.

For me it looks like there will be no change in the current algorithm,
but I am still
a beginner in migration code, and I am probably missing something.

Best regards,
Leo