i40e/i40evf: adjust interrupt throttle less frequently

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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>

...

This commit is contained in:

Jesse Brandeburg 2015-09-28 14:16:54 -04:00 • committed by Jeff Kirsher

parent c56625d597

commit ee2319cf17

8 changed files with 53 additions and 8 deletions

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2

drivers/net/ethernet/intel/i40e/i40e.h

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drivers/net/ethernet/intel/i40e/i40e_main.c

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drivers/net/ethernet/intel/i40e/i40e_txrx.c

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drivers/net/ethernet/intel/i40e/i40e_txrx.h

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drivers/net/ethernet/intel/i40evf/i40e_txrx.c

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drivers/net/ethernet/intel/i40evf/i40e_txrx.h

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drivers/net/ethernet/intel/i40evf/i40evf.h

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drivers/net/ethernet/intel/i40evf/i40evf_main.c

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