Roland Dreier wrote:
Arlin> Hi Roland, I have a question about uverbs
Arlin> cq_events. Currently, uverbs has one event (fd) handle that
Arlin> processes all CQ events. You mentioned earlier that you
Arlin> would possibly add support for more CQ events. Are you
Arlin> thinking one per CQ, or limiting to a small number like one
Arlin> per processor? If the thinking is NOT one per CQ then it
Arlin> may be somewhat restricitive to user applications that have
Arlin> multple connections with many CQs to process.
My thinking was a small number, to match the 1.2 IBA spec's idea of
having a fixed number of CQ event handlers available and also to match
the capabilities of MSI-X interrupts. However, the idea of being able
to dynamically create an arbitrary number of CQ event FDs is
interesting. I need to think about how feasible this is.
Arlin> If the thinking is one per CQ then is fd's the way to go
Arlin> since we can have 1000's of CQs?
I don't know of a different way to implement this...
I guess this is no worse than sockets consuming a FD with every new
connection.
- R.
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