[patch 04/71] ixgbe: initialize interrupt throttle rate

[Greg KH]

2.6.26-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Andy Gospodarek <andy@xxxxxxxxxxxxx>

commit 15e79f24b60c4b0bf8019423bda4e03a576b02f2 upstream

This commit dropped the setting of the default interrupt throttle rate.

commit 021230d40ae0e6508d6c717b6e0d6d81cd77ac25
Author: Ayyappan Veeraiyan <ayyappan.veeraiyan@xxxxxxxxx>
Date:   Mon Mar 3 15:03:45 2008 -0800

    ixgbe: Introduce MSI-X queue vector code

The following patch adds it back.  Without this the default value of 0
causes the performance of this card to be awful.  Restoring these to the
default values yields much better performance.

This regression has been around since 2.6.25.

Signed-off-by: Andy Gospodarek <andy@xxxxxxxxxxxxx>
Acked-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/ixgbe/ixgbe_main.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2258,6 +2258,12 @@ static int __devinit ixgbe_set_interrupt
 	int vector, v_budget;
 
 	/*
+	 * Set the default interrupt throttle rate.
+	 */
+	adapter->rx_eitr = (1000000 / IXGBE_DEFAULT_ITR_RX_USECS);
+	adapter->tx_eitr = (1000000 / IXGBE_DEFAULT_ITR_TX_USECS);
+
+	/*
 	 * It's easy to be greedy for MSI-X vectors, but it really
 	 * doesn't do us much good if we have a lot more vectors
 	 * than CPU's.  So let's be conservative and only ask for

-- 
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