[ofa-general] Re: [RFC] [PATCH 0/3] 2.6.22 or 23 ib: add path record cache

[Michael S. Tsirkin]

> >4. Why do we need yet another API and yet another module to speed up just
> >RDMA/CM path record queries?  We now get 2 ways to do this (with/without the
> >cache).  Shouldn't there be just one?
> 
> I did consider this, but the cache operates synchronously, and ib_sa interface
> is asynchronous.  I tried to make the API make sense for the cache.  The rdma_cm
> doesn't really take advantage of the synchronous interface, but I believe that
> ipoib could.  Converting the ib_local_sa to an asynchronous interface requires
> adding registration calls, and an ability to cancel operations.

Why can't it operate below the existing ib_sa interface?
Does any client really care whether the record came from the SA
or from the cache?

-- 
MST