[ofw] WinOF interoperable with Linux OpenIB

[Smith, Stan]

Hello,
  Is SDP part of openib-windows src tree or is it part of a Mellanox
distribution?
 
thanks,
 
stan.

________________________________

From: Tzachi Dar [mailto:tzachid at mellanox.co.il] 
Sent: Thursday, October 11, 2007 8:14 AM
To: Smith, Stan; Greg Rodgers; ofw at lists.openfabrics.org
Subject: RE: [ofw] WinOF interoperable with Linux OpenIB


Let me try and introduce another option to connect between windows and
Linux: SDP
 
Mellanox has an SDP implementation for windows that can be used to
connect between windows and Linux.
It has the following advantages:
    1) Reaches the wire speed with one connection and small packets.
(Much better then ipoib-cm that is not written yet).
    2) Very low latency (~7us).
    3) You can write your program as a normal socket program. Please
note that the socket API is much better documented than the DAPL one.
 
Thanks
Tzachi


________________________________

	From: ofw-bounces at lists.openfabrics.org
[mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Smith, Stan
	Sent: Thursday, October 11, 2007 5:00 PM
	To: Greg Rodgers; ofw at lists.openfabrics.org
	Subject: RE: [ofw] WinOF interoperable with Linux OpenIB
	
	
	Hello,
	  As Sean pointed out, the IB connection manager is the issue;
different CM connection protocols between Linux and Windows. The
DAT/DAPL sides, if they could get connected, would have no problems
exchanging messages. Once upon a time, in a land, far, far away....an
early MPI/DAPL kludge was setup such that a TCP/IP socket connection was
used to exchange IB Queue Pair (QP) information then used to link remote
QPs; not recommended or supported in Windows.
	About 9 months ago Voltaire was slated to start work on a
connected mode IPoIB for Windows (64K MTU); no telemetry since then.
	So sadly 2K MTU IPoIB is about the best there is at this
juncture.
	 
	stan.

________________________________

	From: ofw-bounces at lists.openfabrics.org
[mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Greg Rodgers
	Sent: Wednesday, October 10, 2007 6:42 PM
	To: ofw at lists.openfabrics.org
	Subject: [ofw] WinOF interoperable with Linux OpenIB
	
	


	We would like to link a Windows machine to a Linux machine with
InfiniBand and use DAPL.  IPoIB is not fast enough.   On the Linux side
we have OFED 1.2 with RHEL 5.1.    I am new to OpenIB but I hear that
Windows would have a problem with RDMA cm.   Can anyone give me some
high level advice before I get the hardware?   The Windows machine will
be Windows 2003 R2 with Mellonox SDR card. 
	
	Thank you. 
	
	Greg Rodgers 

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