tcp_close during async accept

Steve Davis <>
Thu Jul 9 01:35:26 CEST 2009


Hi Jim,

Indeed you are correct. I don't need it and my expectation was wrong
about its underlying meaning! I was just coming back to post that the
bug was in my brain/code and not the platform code.

Thank you for response (sic!).

Regards,
Steve

On Jul 8, 6:16 pm, Jim Morris <> wrote:
> I doubt this is the problem, but I notice you both use tcp keep alive.
> In the past this option has had issues in various TCP stacks, and if
> my memory serves me correctly its use was frowned upon. That may be
> old data, but I have been writing servers for many many years and have
> never used that option.
>
> I prefer to have the application protocol include some type of ping
> that the client sends to the server every 30 seconds, this keeps any
> intermediate NAT/Firewall box from losing the connection, and allows
> the server to know when a client has vanished due to a cable unplug or
> router going away (ie it never sees the FIN or RST). This works well
> for HTTP long-poll type clients as well as proprietary clients.
>
> On Jul 8, 3:17 pm, Steve Davis <> wrote:
>
>
>
>
>
> > Joel et al.
>
> > I'm not sure if this is related but I'm seeing the same thing about
> > 30-50$ of the time on a client socket connection when using...
>
> >   ok = inet:setopts(Socket, [{packet, http_bin}, {keepalive, true}]),
> >   case gen_tcp:recv(Socket, 0, Timeout) of
> >   ...
>
> > ...possible bug in R13B01, or perhaps a bug in my usage of the socket?
>
> > /sd
>
> > On Jul 6, 11:20 am, Joel Reymont <> wrote:
>
> > > I'm playing with Serge's "Non-blocking TCP server using OTP  
> > > principles" [1]. When spawning a large number of connections almost at  
> > > once, I'm seeing tcp_close messages on the client end, even before  
> > > seeing inet_async on the client end.
>
> > > I may spawn 700 client connections and only half may go through, even  
> > > though my backlog option is 1024, e.g.
>
> > >      Opts = [binary,
> > >              {packet, 0},
> > >              {reuseaddr, true},
> > >              {keepalive, true},
> > >              {backlog, 1024},
> > >              {active, false}],
> > >      case gen_tcp:listen(Port, Opts) of
> > >          {ok, Socket} ->
> > >              %% Create first accepting process
> > >              {ok, Ref} = prim_inet:async_accept(Socket, -1),
> > > ...
>
> > > Any suggestions on what's going on?
>
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