Thanks a lot for the good information.
From: Steve Wise <[EMAIL PROTECTED]>
To: SEGERS Koen <[EMAIL PROTECTED]>
CC: david elsen <[EMAIL PROTECTED]>, [email protected]
Subject: Re: [ofa-general] Open Fabrics iWARP Driver for Chesio T3 card
Date: Thu, 28 Jun 2007 08:55:40 -0500
SEGERS Koen wrote:
What is the benefit of using the iWARP driver? Do you offload the traffic
comming from the cluster directly to the chelsio card (RDMA directly to
Chelsio)?
iWARP is a suite of standard protocols that implement RDMA over a TCP or
SCTP connection. The devices that support iWARP usually implement all of
these protocols (including TCP/IP/ethernet) in hardware. The device
drivers for these devices plug into the Linux/OFA RDMA core and support the
Linux/OFA RDMA verbs which are mostly common between both IB and iWARP.
So think of it as an RDMA transport that uses standard Ethernet and IP
technology. There is no wire-level interoperability between IB and iWARP:
They are different L1-L4 protocol stacks below the RDMA API. But _above_
the RDMA API, you can have a single application use the Linux RDMA Verbs
interface and deploy that same application over both IB networks and IW
networks.
Application/Middle-ware examples include MPI, iSCSI/iSER, and NFS-RDMA.
Would it be beneficial to have the iWARP driver installed on nodes that
communicate with clients over IP and with other servers (of its cluster)
over IB? We are now using SDP as an intercluster protocol, but in the
future we are probably going to VERBS for it.
I'm not sure how you would utilize it in your setup. But I don't
understand your cluster architecture to say for sure whether it might help
you or not.
You might contact the iWARP providers directly to help understand if their
solutions can help you. Also, there are other technologies that these
devices typically support that might be helpful for you.
Can we read the documentation on a website somewhere?
The iWARP Protocols are IETF IDs and RFCs that can be found at
http://www.ietf.org/html.charters/rddp-charter.html
There is other information on RDMA over TCP/IP at
http://www.rdmaconsortium.org/home
Hope this helps.
Steve.
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