[openib-general] Port reuse issue for rdma_cm/iwarp
caitlinb at broadcom.com
Tue Sep 26 13:36:43 PDT 2006
openib-general-bounces at openib.org wrote:
> We are facing a problem while running back-to-back
> applications using the same port number for rdma_cm over
> iwarp (Ammasso). The port seems to be busy for about 60
> seconds after each disconnect.
> The first execution finishes without any problems or errors.
> When the execution is repeated immediately, we see a
> RDMA_CM_EVENT_REJECTED event on the active connect side.
> However, if we use a different port or if we include a delay
> of more than 60 seconds between the runs, we do not see this problem.
> Is this a known issue? Is there anyway to force a immediate
> reuse of the port?
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
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