netdev - [PATCH] core: Call net_tx_action only if work pending

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Date:	Tue, 08 May 2007 13:01:30 +0530
From:	Krishna Kumar <krkumar2@...ibm.com>
To:	netdev@...r.kernel.org
Cc:	krkumar2@...ibm.com, Krishna Kumar <krkumar2@...ibm.com>
Subject: [PATCH] core: Call net_tx_action only if work pending

Optimize call to net_tx_action only if work is pending.

Patch against net-2.6.22.git

Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>
---
diff -ruNp org/net/core/dev.c new/net/core/dev.c
--- org/net/core/dev.c	2007-04-09 12:43:15.000000000 +0530
+++ new/net/core/dev.c	2007-04-09 12:43:42.000000000 +0530
@@ -3474,7 +3474,8 @@ static int dev_cpu_callback(struct notif
 	*list_net = oldsd->output_queue;
 	oldsd->output_queue = NULL;
 
-	raise_softirq_irqoff(NET_TX_SOFTIRQ);
+	if (sd->completion_queue || sd->output_queue)
+		raise_softirq_irqoff(NET_TX_SOFTIRQ);
 	local_irq_enable();
 
 	/* Process offline CPU's input_pkt_queue */
-
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