tree 80a240db64bdba55f2903ac113aad7b45931a890
parent 3c6c065a510ed59f7fddabac4be2f932ecfe9275
author Mitko Haralanov <mitko.haralanov@intel.com> 1445869721 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1445935391 +0900

staging/rdma/hfi1: Allow tuning of SDMA interrupt rate

The SDMA engines were configured to generate progress interrupts every time they
processed N/2 descriptors (where N is the size of the descriptor queue). This
interval was too infrequent, leading to degraded performance.

This commit adds a module parameter, as well as a recommended default, which
allows for the tuning of the interrupt frequency.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>