[openib-general] Re: DMA mapping on sparc64

[Michael S. Tsirkin]

Hello!
Quoting r. Roland Dreier (roland at topspin.com) "Re: DMA mapping on sparc64":
>     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.

Maybe for IP over IB you can have a pool of pre-allocated buffers.