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[smsc75xx] Move RX FIFO overflow message to DBGLVL_EXTRA

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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 <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-03-11 22:33:51 +00:00
parent e0fc8fe781
commit 7f80eb511e
1 changed files with 2 additions and 1 deletions
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3
src/drivers/net/smsc75xx.c
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@@ -915,7 +915,8 @@ static void smsc75xx_poll ( struct net_device *netdev ) {
/* Record RX FIFO overflow if applicable */ /* Record RX FIFO overflow if applicable */
if ( int_sts & SMSC75XX_INT_STS_RDFO_INT ) { 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 ); netdev_rx_err ( netdev, NULL, -ENOBUFS );
int_sts &= ~SMSC75XX_INT_STS_RDFO_INT; int_sts &= ~SMSC75XX_INT_STS_RDFO_INT;
} }