Adrien Guillon wrote:
On Tue, Jul 8, 2008 at 7:02 AM, Or Gerlitz <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Please note that you have to have a netdevice up and running for
the IP subnet addresses you would be using with the rdma-cm. In
the IB case, this means IPoIB and in the iWARP case, it means a
network device set by the iWARP HW provider, in the current
implementations, it means Gb Ethernet devices.
Or.
If I run IPoIB, do the RDMA operations involve the kernel? How high
is the cost of abstraction to use RMDA with IPoIB on infiniband?
No, IPoIB doesn't use RDMA operations:
The classical IPoIB is being implemented using UD QP (which doesn't
support RDMA)
The connected mode of IPoIB is being implemented using RC QP (which
supports RDMA operations)
but RDMA is not being used in this mode as well.
Dotan
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