From 7f80eb511e9bbbf74de56d110f351f0b1b052d76 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Wed, 11 Mar 2015 22:33:51 +0000 Subject: [PATCH] [smsc75xx] Move RX FIFO overflow message to DBGLVL_EXTRA RX FIFO overflow is almost inevitable since the (usable) USB2 bus bandwidth is approximately one quarter of the Ethernet bandwidth. Avoid flooding the console with RX FIFO overflow messages in a standard debug build. With TCP SACK implemented, the RX FIFO overflow no longer causes a catastrophic drop in throughput. Experimentation shows that HTTP downloads now progress at a fairly smooth 250Mbps, which is around the maximum speed attainable for a USB2 NIC. Signed-off-by: Michael Brown --- src/drivers/net/smsc75xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/drivers/net/smsc75xx.c b/src/drivers/net/smsc75xx.c index c6328517f..017e02a59 100644 --- a/src/drivers/net/smsc75xx.c +++ b/src/drivers/net/smsc75xx.c @@ -915,7 +915,8 @@ static void smsc75xx_poll ( struct net_device *netdev ) { /* Record RX FIFO overflow if applicable */ if ( int_sts & SMSC75XX_INT_STS_RDFO_INT ) { - DBGC ( smsc75xx, "SMSC75XX %p RX FIFO overflowed\n", smsc75xx ); + DBGC2 ( smsc75xx, "SMSC75XX %p RX FIFO overflowed\n", + smsc75xx ); netdev_rx_err ( netdev, NULL, -ENOBUFS ); int_sts &= ~SMSC75XX_INT_STS_RDFO_INT; }