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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>> </span></font><b><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
openib-general-bounces@openib.org [mailto:openib-general-bounces@openib.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Viswanath Krishnamurthy<br>
> <b><span style='font-weight:bold'>Sent:</span></b> Friday, June 30, 2006
1:26 PM<br>
<br>
</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>> In the current
communication manager (CM) implementation how is the REP MAD<br>
> getting lost handled. When the REP gets lost, the cm_dup_req_handler gets
called<br>
> which currently enters the default condition and does nothing. The
client retries <br>
> the number of timers it is configured to and fails. If the first REP
gets lost, the connection<br>
> never gets established. So what should be the behavior ?</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The IBTA standard in section 12.9.7
defines this situation in the state machine.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In this case the Active side will have
sent a REQ. It will be in REQ Sent state (or REP Wait in passive side
sent an MRA). In these states the Active side will have a timer
running. If the REP is lost, the Active side will timeout and move to the
“Timeout” state. In this state, the active side has the
option of resending the REQ or sending a REJ and giving up on the connection
attempt. In general it is best for the active side to perform a few retries
before it gives up.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>During this sequence the passive side will
think it has sent its REP (eg. the one which was lost) so it will be in the REP
Sent state (see 12.9.7.2). In this state if it receives another matching
REQ, it is to resend its REP. There is also a timer on the passive side
in this state (waiting for the RTU). If the passive side times out it
will move to RTU Timeout and has the option to resent its REP or send a REJ and
give up the connection attempt. Here too it is best for the passive side
to perform a few retries before giving up.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Todd Rimmer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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