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Fine Sean.<br>
<br>
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.<br>
<br>
Thanks,<br>
Prasanna<br>
<br>
<br>
<br>
<br>
Sean Hefty wrote:
<blockquote
cite="mid:164FC43F4A824C94B965E1623519BB2E@amr.corp.intel.com"
type="cite">
<blockquote type="cite">
<pre wrap="">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.
</pre>
</blockquote>
<pre wrap=""><!---->
It does not support asynchronous callbacks. This matches the behavior on Linux.
</pre>
<blockquote type="cite">
<pre wrap="">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.
</pre>
</blockquote>
<pre wrap=""><!---->
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
</pre>
</blockquote>
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