我用的TP-LINK TL-WN721N无线网卡 ，开发板和主机能互相ping通
但是有偶尔会有丢包，这是是什么原因造成的？
无线网卡工作时会不定时的断开USB连接，然后立马有自己连上了，
信息如下：
[root@FriendlyARM /]# usb 1-1: USB disconnect, device number 2
usb 1-1.1: USB disconnect, device number 4
phy1 -> rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1208 with error -19.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 0 - CWmin: 2, CWmax: 3, Aifs: 2, TXop: 47.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 94.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - CWmin: 4, CWmax: 10, Aifs: 3, TXop: 0.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 3 - CWmin: 4, CWmax: 10, Aifs: 7, TXop: 0.
cfg80211: Calling CRDA to update world regulatory domain
usb 1-1: new full speed USB device number 5 using s3c2410-ohci
usb 1-1: New USB device found, idVendor=058f, idProduct=9254
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1: Product: Generic USB Hub
usb 1-1: Manufacturer: ALCOR
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
usb 1-1.1: new full speed USB device number 6 using s3c2410-ohci
usb 1-1.1: New USB device found, idVendor=148f, idProduct=5370
usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.1: Product: 802.11 n WLAN
usb 1-1.1: Manufacturer: TPlink
usb 1-1.1: SerialNumber: 1.0
usb 1-1.1: reset full speed USB device number 6 using s3c2410-ohci
phy2 -> rt2x00_set_chip: Info - Chipset detected - rt: 5390, rf: 5370, rev: 0502.
希望大家能给点建议。谢谢
