diff mbox

[net-next-2.6,09/18] igb: cap interrupts at 20K per queue when in itr mode 3

Message ID 20100217110317.17723.7586.stgit@localhost.localdomain
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Kirsher, Jeffrey T Feb. 17, 2010, 11:03 a.m. UTC 
From: Nick Nunley <nicholasx.d.nunley@intel.com>

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>
---

 drivers/net/igb/igb_main.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


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diff mbox

Patch

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index eb48e1a..4ccc7fc 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -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;