Fine Sean.
Just one more clarification in the case of *kernel* mode IBAL
'ib_create_cq', async call back is called from HCA DPC or a dedicated
wait thread is created even for kernel mode.
Thanks,
Prasanna
Sean Hefty wrote:
I would like to know if libibverbs 'ibv_create_cq' supports
asynchronous callback on completion of post send transfer or only cq
polling is supported.
It does not support asynchronous callbacks. This matches the behavior on Linux.
I observe IBAL 'ib_create_cq' supports asynchronous callback. So is the
winverbs 'ibv_create_cq' constrained to polling mechanism only due to
user mode mailbox access to HCA.
IBAL supports asynchronous callbacks, but to do so, it allocates a thread that
waits for CQ events, then notifies the user in a callback. The application can
achieve the same behavior by allocating a dedicated thread to wait for CQ
events, and invoking a notification function when a CQ event occurs.
Winverbs basically pushes the application threading model entirely into the
application, rather than automatically allocating threads in order to provide a
callback event model.
- Sean
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