mv643xx_eth: set sane default receive coalescing timeout

A receive coalescing timeout of 250 usec appears to strike a good
balance between allowing enough received frames to be aggregated for
LRO to do its job and not allowing the connection to stall due to
delaying ACKs to the remote end for too long.
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mv643xx_eth.c

@@ -2957,7 +2957,7 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 
 	netif_carrier_off(dev);
 
-	set_rx_coal(mp, 0);
+	set_rx_coal(mp, 250);
 	set_tx_coal(mp, 0);
 
 	err = register_netdev(dev);