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[PATCH] use NETIF_F_LLTX in bonding device

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: [PATCH] use NETIF_F_LLTX in bonding device
From: Arthur Kepner <akepner@xxxxxxx>
Date: Tue, 15 Mar 2005 10:29:16 -0800 (PST)
Cc: netdev@xxxxxxxxxxx
Sender: netdev-bounce@xxxxxxxxxxx
Lock contention on the bonding device's xmit_lock can 
become a bottleneck when 3 or more gige links are aggregated. 
And it looks like it's unnecessary too, so use the 
NETIF_F_LLTX flag to avoid grabbing this lock. 

Signed-off-by: <akepner@xxxxxxx>

--- linux.orig/drivers/net/bonding/bond_main.c  2005-03-14 14:08:29.000000000 
-0800
+++ linux/drivers/net/bonding/bond_main.c       2005-03-14 17:08:57.000000000 
-0800
@@ -4306,6 +4306,10 @@ static int __init bond_init(struct net_d
         */
        bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
 
+       /* don't acquire bond device's xmit_lock when 
+        * transmitting */
+       bond_dev->features |= NETIF_F_LLTX;
+
        /* By default, we declare the bond to be fully
         * VLAN hardware accelerated capable. Special
         * care is taken in the various xmit functions

--
Arthur

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