netdev - [PATCH] bonding: only send arp monitor packets if no other traffic

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Date:	Wed, 16 May 2012 12:48:28 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: [PATCH] bonding: only send arp monitor packets if no other traffic

In order to minimize network traffic, when using load balancing modes
only send out arp monitor packets if it's been more than delta_in_ticks
jiffies since we either received or transmitted packets.  The rationale
behind this is that if there is a lot of other traffic going on we don't
need the arp monitor packets to determine whether or not the link is
working.

This makes the most difference if you have a lot of hosts all arping
the same target at high frequency.

Signed-off-by: Chris Friesen <chris.friesen@...and.com>
---
 drivers/net/bonding/bond_main.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index bc13b3d..4c8459a 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2885,8 +2885,12 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
 		 * do - all replies will be rx'ed on same link causing slaves
 		 * to be unstable during low/no traffic periods
 		 */
-		if (IS_UP(slave->dev))
-			bond_arp_send_all(bond, slave);
+		if (IS_UP(slave->dev)) {
+			if (time_after_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) ||
+			    time_after_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
+				bond_arp_send_all(bond, slave);
+			}
+		}
 	}
 
 	if (do_failover) {

-- 

Chris Friesen
Software Designer
3500 Carling Avenue
Ottawa, Ontario K2H 8E9
www.genband.com

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