[openib-general] [PATCH 07/16] ehca: interrupt handling routines

[Pradeep Satyanarayana]

openib-general-bounces at openib.org wrote on 05/09/2006 04:35:57 PM:

> >     Heiko> Yes, I agree. It would not be an optimal solution, because
> >     Heiko> other upper level protocols (e.g. SDP, SRP, etc.) or
> >     Heiko> userspace verbs would not be affected by this
> >     Heiko> changes. Nevertheless, how can an improved "scaling" or
> >     Heiko> "SMP" version of IPoIB look like. How could it be
> >     Heiko> implemented?
> >
> > The trivial way to do it would be to use the same idea as the current
> > ehca driver: just create a thread for receive CQ events and a thread
> > for send CQ events, and defer CQ polling into those two threads.
> >
> > Something even better may be possible by specializing to IPoIB of
> > course.
>
> The hardware IRQ should go to some CPU close to the hardware itself.
> The
> softirq (or whatever else) should go to the same CPU that is handling
> the
> user-level task for that message.  Or a CPU close to it, at least.
>
I believe softirqs have a strong CPU affinity and will execute on the same
CPU that
handled the hard irq.

Pradeep
pradeep at us.ibm.com
>
> Segher
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