--- old/drivers/net/forcedeth.c	2009-03-05 10:46:25.000000000 -0800
+++ new/drivers/net/forcedeth.c	2009-03-05 10:46:35.000000000 -0800
@@ -593,6 +593,9 @@
 
 #define NV_TX_LIMIT_COUNT     16
 
+#define NV_DYNAMIC_THRESHOLD        4
+#define NV_DYNAMIC_MAX_QUIET_COUNT  2048
+
 /* statistics */
 struct nv_ethtool_str {
 	char name[ETH_GSTRING_LEN];
@@ -750,6 +753,7 @@
 	u16 gigabit;
 	int intr_test;
 	int recover_error;
+	int quiet_count;
 
 	/* General data: RO fields */
 	dma_addr_t ring_addr;
@@ -832,7 +836,7 @@
  * Maximum number of loops until we assume that a bit in the irq mask
  * is stuck. Overridable with module param.
  */
-static int max_interrupt_work = 15;
+static int max_interrupt_work = 4;
 
 /*
  * Optimization can be either throuput mode or cpu mode
@@ -3418,11 +3422,43 @@
 	}
 }
 
+static inline int nv_change_interrupt_mode(struct net_device *dev, int total_work)
+{
+	struct fe_priv *np = netdev_priv(dev);
+
+	if (optimization_mode == NV_OPTIMIZATION_MODE_DYNAMIC) {
+		if (total_work > NV_DYNAMIC_THRESHOLD) {
+			/* transition to poll based interrupts */
+			np->quiet_count = 0;
+			if (np->irqmask != NVREG_IRQMASK_CPU) {
+				np->irqmask = NVREG_IRQMASK_CPU;
+				return 1;
+			}
+		} else {
+			if (np->quiet_count < NV_DYNAMIC_MAX_QUIET_COUNT) {
+				np->quiet_count++;
+			} else {
+				/* reached a period of low activity, switch
+				   to per tx/rx packet interrupts */
+				if (np->irqmask != NVREG_IRQMASK_THROUGHPUT) {
+					np->irqmask = NVREG_IRQMASK_THROUGHPUT;
+					return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
 static irqreturn_t nv_nic_irq(int foo, void *data)
 {
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
+#ifndef CONFIG_FORCEDETH_NAPI
+	int total_work = 0;
+	int loop_count = 0;
+#endif
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq\n", dev->name);
 
@@ -3449,19 +3485,35 @@
 
 	spin_unlock(&np->lock);
 
-	return IRQ_HANDLED;
 #else
-	spin_lock(&np->lock);
-	nv_tx_done(dev, np->tx_ring_size);
-	spin_unlock(&np->lock);
-
-	if (nv_rx_process(dev, RX_WORK_PER_LOOP)) {
-		if (unlikely(nv_alloc_rx(dev))) {
-			spin_lock(&np->lock);
-			if (!np->in_shutdown)
-				mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
-			spin_unlock(&np->lock);
+	do
+	{
+		int work = 0;
+		if ((work = nv_rx_process(dev, RX_WORK_PER_LOOP))) {
+			if (unlikely(nv_alloc_rx(dev))) {
+				spin_lock(&np->lock);
+				if (!np->in_shutdown)
+					mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
+				spin_unlock(&np->lock);
+			}
 		}
+
+		spin_lock(&np->lock);
+		work += nv_tx_done(dev, TX_WORK_PER_LOOP);
+		spin_unlock(&np->lock);
+
+		if (!work)
+			break;
+
+		total_work += work;
+
+		loop_count++;
+	}
+	while (loop_count < max_interrupt_work);
+
+	if (nv_change_interrupt_mode(dev, total_work)) {
+		/* setup new irq mask */
+		writel(np->irqmask, base + NvRegIrqMask);
 	}
 
 	if (unlikely(np->events & NVREG_IRQ_LINK)) {
@@ -3507,6 +3559,10 @@
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
+#ifndef CONFIG_FORCEDETH_NAPI
+	int total_work = 0;
+	int loop_count = 0;
+#endif
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq_optimized\n", dev->name);
 
@@ -3533,19 +3589,35 @@
 
 	spin_unlock(&np->lock);
 
-	return IRQ_HANDLED;
 #else
-	spin_lock(&np->lock);
-	nv_tx_done_optimized(dev, TX_WORK_PER_LOOP);
-	spin_unlock(&np->lock);
-
-	if (nv_rx_process_optimized(dev, RX_WORK_PER_LOOP)) {
-		if (unlikely(nv_alloc_rx_optimized(dev))) {
-			spin_lock(&np->lock);
-			if (!np->in_shutdown)
-				mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
-			spin_unlock(&np->lock);
+	do
+	{
+		int work = 0;
+		if ((work = nv_rx_process_optimized(dev, RX_WORK_PER_LOOP))) {
+			if (unlikely(nv_alloc_rx_optimized(dev))) {
+				spin_lock(&np->lock);
+				if (!np->in_shutdown)
+					mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
+				spin_unlock(&np->lock);
+			}
 		}
+
+		spin_lock(&np->lock);
+		work += nv_tx_done_optimized(dev, TX_WORK_PER_LOOP);
+		spin_unlock(&np->lock);
+
+		if (!work)
+			break;
+
+		total_work += work;
+
+		loop_count++;
+	}
+	while (loop_count < max_interrupt_work);
+
+	if (nv_change_interrupt_mode(dev, total_work)) {
+		/* setup new irq mask */
+		writel(np->irqmask, base + NvRegIrqMask);
 	}
 
 	if (unlikely(np->events & NVREG_IRQ_LINK)) {
@@ -3632,21 +3704,22 @@
 	struct net_device *dev = np->dev;
 	u8 __iomem *base = get_hwbase(dev);
 	unsigned long flags;
-	int pkts, retcode;
+	int retcode;
+	int tx_work, rx_work;
 
 	if (!nv_optimized(np)) {
 		spin_lock_irqsave(&np->lock, flags);
-		nv_tx_done(dev, np->tx_ring_size);
+		tx_work = nv_tx_done(dev, np->tx_ring_size);
 		spin_unlock_irqrestore(&np->lock, flags);
 
-		pkts = nv_rx_process(dev, budget);
+		rx_work = nv_rx_process(dev, budget);
 		retcode = nv_alloc_rx(dev);
 	} else {
 		spin_lock_irqsave(&np->lock, flags);
-		nv_tx_done_optimized(dev, np->tx_ring_size);
+		tx_work = nv_tx_done_optimized(dev, np->tx_ring_size);
 		spin_unlock_irqrestore(&np->lock, flags);
 
-		pkts = nv_rx_process_optimized(dev, budget);
+		rx_work = nv_rx_process_optimized(dev, budget);
 		retcode = nv_alloc_rx_optimized(dev);
 	}
 
@@ -3657,6 +3730,8 @@
 		spin_unlock_irqrestore(&np->lock, flags);
 	}
 
+	nv_change_interrupt_mode(dev, tx_work + rx_work);
+
 	if (unlikely(np->events & NVREG_IRQ_LINK)) {
 		spin_lock_irqsave(&np->lock, flags);
 		nv_link_irq(dev);
@@ -3677,10 +3752,10 @@
 		}
 		spin_unlock_irqrestore(&np->lock, flags);
 		__napi_complete(napi);
-		return pkts;
+		return rx_work;
 	}
 
-	if (pkts < budget) {
+	if (rx_work < budget) {
 		/* re-enable interrupts
 		   (msix not enabled in napi) */
 		spin_lock_irqsave(&np->lock, flags);
@@ -3691,7 +3766,7 @@
 
 		spin_unlock_irqrestore(&np->lock, flags);
 	}
-	return pkts;
+	return rx_work;
 }
 #endif