Commit abe1c363 authored Feb 17, 2010 by Nick Nunley Committed by David S. Miller Feb 17, 2010

igb: cap interrupts at 20K per queue when in itr mode 3



In order to maintain similar performance between MSI-X and
legacy/MSI interrupts, this patch reduces the number of interrupts
when receiving small packets to 20K when in interrupt throttle
rate mode 3.

Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 2d0b0f69

drivers/net/igb/igb_main.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -3260,6 +3260,10 @@ static void igb_update_ring_itr(struct igb_q_vector *q_vector)
		else
		new_val = avg_wire_size / 2;

		/* when in itr mode 3 do not exceed 20K ints/sec */
		if (adapter->rx_itr_setting == 3 && new_val < 196)
		new_val = 196;

		set_itr_val:
		if (new_val != q_vector->itr_val) {
		q_vector->itr_val = new_val;