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 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
