The default RX_QLEN()/TX_QLEN() didn't consider susper 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: Ming Lei <[email protected]> --- drivers/net/usb/usbnet.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index d74de07..e4811d7 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -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; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
