[openib-general] Mellanox HCAs: outstanding RDMAs

[Roland Dreier]

    Manpreet> Mellanox HCA can handle has been configured at 4
    Manpreet> (mthca_main.c: default_profile: rdb_per_qp). And the
    Manpreet> HCAs can support a much higher value (128 I think).

    Manpreet> Could we move this value higher or atleast make it
    Manpreet> configurable?

Leonid Arsh has a patch that I will integrate soon that makes this
configurable.

However, I'm curious.  Do you have a workload where this actually
makes a measurable difference?  It seems that having 4 RDMA requests
outstanding on the wire should be enough to get things to pipeline
pretty well.

If you haven't tested this, right now you can of course edit
mthca_main.c to change the default value and recompile.

 - R.