[openib-general] Re: userspace doorbells

[Roland Dreier]

    Michael> Roland, I see you have made the doorbell page volatile.
    Michael> This makes sence, and must be enough on x86_64, but for
    Michael> this to work on PPC, wont you still need to insert a
    Michael> write memory barrier, to guard against the CPU
    Michael> re-ordering writes to hardware and to the WQE?  Since you
    Michael> do it in kernel, why not in userspace?

I'm working on it... see the <infiniband/arch.h> file I added to
libibverbs for the start of my plan.

 - R.