From: Ming Lei Date: Thu, 25 Jul 2013 05:47:54 +0000 (+0800) Subject: USBNET: increase max rx/tx qlen for improving USB3 thoughtput X-Git-Tag: android-x86-4.4-r2~2658^2~452 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=452c447a497dce3c9faeb9ac7f2e1ff39232876b;p=android-x86%2Fkernel.git 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: Ming Lei Signed-off-by: David S. Miller --- diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index d74de074a438..e4811d7b5af1 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; }