Re: Any TCP VTW users?

[Ryota Ozaki <ozaki-r%netbsd.org@localhost>]

On Thu, Sep 15, 2022 at 9:33 PM Andy Ruhl <acruhl%gmail.com@localhost> wrote:
>
> On Thu, Sep 15, 2022 at 12:34 AM Ryota Ozaki <ozaki-r%netbsd.org@localhost> wrote:
> >
> > Hi,
> >
> > Are there any users of TCP Vestigial Time-Wait (VTW)?
> > The feature is disabled by default and we need to explicitly
> > enable via sysctl to use it.
> >
> > I just want to know if we should still maintain it.
> >
> >   ozaki-r
>
> I wasn't even aware of it. I read the comments in
> sys/netinet/tcp_vtw.c. Seems useful for systems that handle a lot of
> sockets. Pretty neat.
>
> Is there some reason why this is obsolete or something?
>
> Andy

When we do mp-ification of TCP, VTW requires extra efforts;
the code looks not mp-ification friendly.

If nobody uses the feature, we can defer mp-ification of it
or completely ignore it.  So I asked the question.

  ozaki-r