commit ee2319cf17ee64bbd0096f2f8f3f8390c93b1e39
author Jesse Brandeburg <jesse.brandeburg@intel.com> Mon Sep 28 14:16:54 2015 -0400
committer Jeff Kirsher <jeffrey.t.kirsher@intel.com> Mon Oct 19 15:35:12 2015 -0700
tree d8fb0d00f1226eb764ca532f0fbbb4a2f5835520
parent c56625d59726ee2dc4dfd91c8b6c22098abe1ac4

i40e/i40evf: adjust interrupt throttle less frequently

The adaptive ITR (interrupt throttle rate) algorithm was adjusting
the hardware's interrupt rate too frequently.  This caused a lot
of variation in the interrupt rate for fairly constant workloads.

Change the code to have a counter and adjust only once every N
number of interrupts.

Change-ID: I0460f1f86571037484eca5aca36ac4d889cb8389
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>