[openib-general] Re: DMA mapping on sparc64

Roland Dreier roland at topspin.com
Tue Sep 14 21:13:04 PDT 2004


    Michael> I think this is going to break anyway when you actually
    Michael> have more than 4G memory that you can DMA into.  I think
    Michael> its more portable to allocate mads out of some pool,
    Michael> registering this pool with an lkey.

Oh yeah... I forgot to mention that the MAD pool idea doesn't help for
IPoIB, SDP, ... (where we can't control where the buffers we need to
use are allocated)

 - R.



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