RE: [PATCH 1/2] rdma/cm: support option to allow manually setting IB path

Sean Hefty
2009-10-05T18:08:51Z

>On Mon, Oct 05, 2009 at 10:43:44AM -0700, Sean Hefty wrote:
>> Export rdma_set_ib_paths to user space to allow applications to
>> manually set the IB path used for connections. This allows
>> alternative ways for a user space application or library to obtain
>> path record information, including retrieving path information
>> from cached data, avoiding direct interaction with the IB SA.
>> The IB SA is a single, centralized entity that can limit scaling
>> on large clusters running MPI applications.
>
>Um, isn't this kind of low level control exactly why we have the IB
>CM?

There are very few apps that I'm aware of (one to be precise) that have coded
directly to the libibcm.