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

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On Thu, Apr 06, 2017 at 02:47:56PM +0000, Marciniszyn, Mike wrote:

> 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?

Jason
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