[ofw] WinOF interoperable with Linux OpenIB

[Tzachi Dar]

The Linux SDP code is part of the open fabrics distribution. The windows
is not part of open fabrics due to legal issues.
 
Currently there are two ways to get SDP for windows (no royalties):
    1) Binaries - use Mellanox distribution (or other vendor).
    2) source code - Sign an agreement with MS and Mellanox and get the
code.
 
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 6:30 PM
	To: Tzachi Dar; Greg Rodgers; ofw at lists.openfabrics.org
	Subject: RE: [ofw] WinOF interoperable with Linux OpenIB
	
	
	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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