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Commit 452c447a authored by Ming Lei's avatar Ming Lei Committed by David S. Miller
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USBNET: increase max rx/tx qlen for improving USB3 thoughtput 



The default RX_QLEN()/TX_QLEN() didn't consider super speed
USB device, so only max 4 URBs are scheduled at the same time
for tx/rx, then USB3 NIC can't perform very well.

With this patch, both rx and tx thoughput are increased more than
100Mbps when doing iperf test on ax88179_178a USB 3.0 NIC.

Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a88c32ae

drivers/net/usb/usbnet.c

+9 −0
Original line number Diff line number Diff line
@@ -355,6 +355,15 @@ void usbnet_update_max_qlen(struct usbnet *dev) 
		dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;

		dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;

		break;

	case USB_SPEED_SUPER:

		/*

		 * Not take default 5ms qlen for super speed HC to

		 * save memory, and iperf tests show 2.5ms qlen can

		 * work well

		 */

		dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;

		dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;

		break;

	default:

		dev->rx_qlen = dev->tx_qlen = 4;

	}