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Re: Bug#618930: High network latency with ralink usb wireless device

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(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@xxxxxxxxxxxxxxx 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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