[openib-general] Re: RMPP

[Hal Rosenstock]

On Tue, 2005-06-28 at 13:44, Sean Hefty wrote:
> Hal Rosenstock wrote:
> > Hi Sean,
> > 
> > I'm in the process of enabling the receive side RMPP from user space and
> > this is what I'm seeing in terms of RMPP right now. I have a question
> > about the OpenSM side.
> > 
> > SA client OpenSM
> > SA GetTable (PortInfoRecord) -->
> >                              <--  SA GetTableResp (PortInfoRecord)
> > RMPP active, first
> > payload length 0x44C
> > 
> > retries is set to 4 so I see 4 responses (at 2 sec intervals) as the
> > client is not currently ACKing. All is fine up to that point.
> > 
> > At that point, OpenSM sees a large receive which appears to be that send
> > timing out (nothing was sent nor observed on the IB wire).
> > 
> > Could a timed out RMPP send end up as a receive somehow ?
> 
> On the side that sent the MAD?

The side that sent the RMPP MAD response (e.g. OpenSM).

>   That should be no.

That's what I thought. I'm not sure where the problem is but will start
to try to narrow it down.

> On the remote side, a send can timeout, but still be received, since the ACK 
> is unreliable.  But I don't think that this is the situation that you're 
> describing.

No. The remote side appears to be behaving as I would expect (at least
as far as I have gone).

-- Hal