Bug#618930: High network latency with ralink usb wireless device
(see also bugs.debian.org/618930 though AFAIK everything important is
reproduced in this message.)
On 19/03/2011 17:30, Ben Hutchings wrote:
Sorry, no. Please report this upstream to
linux-wireless@vger.kernel.org and cc the bug address.
I have a TP-Link TL-WN321G USB wireless adapter, which is a badged
Ralink RT2070. Under Debian's 2.6.32 this worked smoothly with
rt2870sta. On upgrading to Debian's 2.6.38, however, only rt2800usb was
available and with that I found that ping latency is around 600ms.
== Under 2.6.32, with rt2870sta ==
richard@violeer:~$ uname -a
Linux violeer 2.6.32-5-686 #1 SMP Wed Jan 12 04:01:41 UTC 2011 i686
GNU/Linux
richard@violeer:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 Ralink STA ESSID:"wlan.anjou.terraraq.org.uk"
Nickname:"RT2870STA"
Mode:Managed Frequency=2.442 GHz Access Point:
00:0F:CB:A0:0C:70
Bit Rate=54 Mb/s
RTS thr:off Fragment thr:off
Link Quality=100/100 Signal level:-45 dBm Noise level:-83 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
richard@sfere:~$ ping -qc10 violeer
PING violeer.wlan.anjou.terraraq.org.uk (172.31.59.138) 56(84) bytes of
data.
--- violeer.wlan.anjou.terraraq.org.uk ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9013ms
rtt min/avg/max/mdev = 0.973/1.094/1.490/0.141 ms
== Under 2.6.38, with rt2800usb ==
richard@violeer:~$ uname -a
Linux violeer 2.6.38-1-686 #1 SMP Wed Mar 16 17:37:47 UTC 2011 i686
GNU/Linux
richard@violeer:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:"wlan.anjou.terraraq.org.uk"
Mode:Managed Frequency:2.442 GHz Access Point:
00:0F:CB:A0:0C:70
Bit Rate=18 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=67/70 Signal level=-43 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2 Invalid misc:6 Missed beacon:0
richard@sfere:~$ ping -qc10 violeer
PING violeer.wlan.anjou.terraraq.org.uk (172.31.59.138) 56(84) bytes of
data.
--- violeer.wlan.anjou.terraraq.org.uk ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9006ms
rtt min/avg/max/mdev = 509.111/603.472/630.232/47.090 ms
== lsusb output ==
Bus 001 Device 002: ID 148f:2070 Ralink Technology, Corp. RT2070
Wireless Adapter
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x148f Ralink Technology, Corp.
idProduct 0x2070 RT2070 Wireless Adapter
bcdDevice 1.01
iManufacturer 1 Ralink
iProduct 2 802.11 g WLAN
iSerial 3 1.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 67
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 450mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 7
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 5 1.0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
== dmesg output ==
root@violeer:~# dmesg|grep -E rt2\|wlan
[ 12.344624] Registered led device: rt2800usb-phy0::radio
[ 12.344653] Registered led device: rt2800usb-phy0::assoc
[ 12.344679] Registered led device: rt2800usb-phy0::quality
[ 12.346539] usbcore: registered new interface driver rt2800usb
[ 14.895564] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 18.829895] wlan0: authenticate with 00:0f:cb:a0:0c:70 (try 1)
[ 18.831281] wlan0: authenticated
[ 20.432339] wlan0: associate with 00:0f:cb:a0:0c:70 (try 1)
[ 20.434597] wlan0: RX AssocResp from 00:0f:cb:a0:0c:70 (capab=0x431
status=0 aid=2)
[ 20.434601] wlan0: associated
[ 20.442967] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
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