Re: Sending and Receiving QPs with IPoIB

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On Fri, Jan 19, 2018 at 06:28:15PM +0000, Sanchez, Sebastian wrote:

> Having a sending QP and a receiving QP per node in IPoIB connected
> mode is affecting HFI1 performance because of the resulting
> lopsidedness of QPn to hardware resource mappings. Therefore, we are
> investigating changing this behavior to be compliant to the RFC
> (https://tools.ietf.org/html/rfc4755#section-3.3).
> 
> On a separate email, Roland Dreier mentioned that IPoIB connected
> mode has 2 QPs for historical reasons. We *really* need to know if
> there is some technical reason the implementation is this way before
> cracking open IPoIB to change this.
> 
> Roland Dreier email:
> 
> I assume you're talking about IPoIB connected mode?
> 
> I think the reason is just historical - the code to use one QP in
> each direction was never written, and no one has cared enough to do
> it.

My strong advice is that if you care about IPoIB performance then you
implement the rdma_netdev interface and forget about connected mode.

It will be much easier for you than trying to get a patch to
completely rework IPoIB applied..

Jason
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