[openib-general] Port reuse issue for rdma_cm/iwarp

[Dennis Dalessandro]

Has to do with the socket going into the time wait state, which is
because it is waiting for any possibly still in flight packets as
Caitlin said.  From what I was told, there is not really any option to
get around this with the Ammasso card. This was back when they were
still in business though, and for their ccil driver.  Probably better
off to use different ports.

-Dennis


On Tue, 2006-09-26 at 17:53 -0400, Sundeep Narravula wrote:
> > TCP restricts prompt re-use of the same Source/Destination
> > Address/Port pair while old traffic could still be in-flight.
> > This is generally not an issue because prompt re-use of the
> > exact four tuple is rare.
> >
> > Is there a special reason why your application needs to
> > reuse the same port from the active side? If the port number
> > is being used to identify the rank, could private data be
> > used instead?
> 
> Our application is primarily an invocation of multiple independent parallel
> jobs which all need to connect or each other on each invocation. Since
> this is a TCP limitation, is there any interface similar to setsockopt
> with TCP_NODELAY. We probably need to use different ports otherwise.
> 
> Thanks,
>   --Sundeep.
> 
> >
> >
> >
> 
> 
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