[ofa-general] Open Fabrics iWARP Driver for Chesio T3 card

[david elsen]

Thanks a lot for the good information.


>From: Steve Wise <swise at opengridcomputing.com>
>To: SEGERS Koen <Koen.SEGERS at VRT.BE>
>CC: david elsen <elsen_david at hotmail.com>,  general at lists.openfabrics.org
>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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