diff options
| author |   Ming Lei <ming.lei@canonical.com> | 2013-07-25 13:47:54 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-07-27 20:10:57 -0700 |
| commit | 452c447a497dce3c9faeb9ac7f2e1ff39232876b (patch) | |
| tree | 1ef4704e1598a67974e6ca000b1cb1d2a4105c53 /drivers/net/usb | |
| parent | USBNET: centralize computing of max rx/tx qlen (diff) | |
| download | linux-dev-452c447a497dce3c9faeb9ac7f2e1ff39232876b.tar.xz linux-dev-452c447a497dce3c9faeb9ac7f2e1ff39232876b.zip | |
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 <ming.lei@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/usb')
| -rw-r--r-- | drivers/net/usb/usbnet.c | 9 |
1 files changed, 9 insertions, 0 deletions
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; } |