From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Lei Subject: [PATCH 2/2] USBNET: increase max rx/tx qlen for improving USB3 thoughtput Date: Thu, 25 Jul 2013 13:47:54 +0800 Message-ID: <1374731274-27415-3-git-send-email-ming.lei@canonical.com> References: <1374731274-27415-1-git-send-email-ming.lei@canonical.com> Cc: Oliver Neukum , netdev@vger.kernel.org, linux-usb@vger.kernel.org, Ming Lei To: "David S. Miller" , Greg Kroah-Hartman Return-path: Received: from mail-pd0-f180.google.com ([209.85.192.180]:40805 "EHLO mail-pd0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753357Ab3GYFsg (ORCPT ); Thu, 25 Jul 2013 01:48:36 -0400 In-Reply-To: <1374731274-27415-1-git-send-email-ming.lei@canonical.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- 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