RE: [PATCH v2 19/20] IB/rdmavt, IB/qib, IB/hfi1: Make percpu refcount optional for user MRs

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> > There were two patches in the patch series, one reworks the rdmavt
> > read side MR to allow for getting rid of an explicit RCU at deref
> > time.  The second module parameter was intended to allow for a faster
> > memory registration for user MRs as an option.
> 
> If it is faster why wouldn't you always just use that mode?
> 

It would be faster mr deregistration, but slower data patch since atomic operations would then be done.

Mike


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