I have 2 USB wireless dongles:
- Generic Realtek RTL8187 using rtl8187 driver
- Netgear WN111v2 [Atheros AR9001-U(2)NG] using ar9170usb driver
Performance of the Netgear has degraded severely since updating to Arch
Linux kernel 2.6.36.1-3 from 2.6.35.4-2, also reported by
http://article.gmane.org/gmane.linux.kernel.wireless.general/59911
Note that I only installed and enabled wlan1 because wlan0 was
performing so badly.
# lsusb -v -d 0bda:8187
Bus 002 Device 005: ID 0bda:8187 Realtek Semiconductor Corp. RTL8187
Wireless Adapter
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0bda Realtek Semiconductor Corp.
idProduct 0x8187 RTL8187 Wireless Adapter
bcdDevice 1.00
iManufacturer 1 Manufacturer_Realtek_RTL8187_
iProduct 2 RTL8187_Wireless_LAN_Adapter
iSerial 3 001AEF0050E6
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 Wireless Network Card
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 0 (Defined at Interface level)
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 5 Bulk-IN,Bulk-OUT,Bulk-OUT
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 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
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
# lsusb -v -d 0846:9001
Bus 002 Device 004: ID 0846:9001 NetGear, Inc. WN111(v2) RangeMax Next
Wireless [Atheros AR9001U-(2)NG]
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 255 Vendor Specific Protocol
bMaxPacketSize0 64
idVendor 0x0846 NetGear, Inc.
idProduct 0x9001 WN111(v2) RangeMax Next Wireless [Atheros
AR9001U-(2)NG]
bcdDevice 1.06
iManufacturer 16 ATHER
iProduct 32 USB2.0 WLAN
iSerial 48 12345
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 46
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 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 0x82 EP 2 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 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 255 Vendor Specific Protocol
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"waddles"
Mode:Managed Frequency:2.412 GHz Access Point:
00:22:3F:07:42:F3
Bit Rate=117 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=34/70 Signal level=-76 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
wlan1 IEEE 802.11bg ESSID:"waddles"
Mode:Managed Frequency:2.412 GHz Access Point:
00:22:3F:07:42:F3
Bit Rate=36 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=44/70 Signal level=-66 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
tun0 no wireless extensions.
My network looks like this:
Linux Router/AP DSL Modem
(wlan0) 192.168.1.57 ---/--- 192.168.1.1 --- 192.168.0.1 --- Internet
(wlan1) 192.168.1.4 ---/---
Between the router and the modem is an ethernet crossover cable.
# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=63 time=2.23 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=63 time=2.11 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=63 time=1.88 ms
^C
--- 192.168.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 1.882/2.076/2.235/0.146 ms
# route add -host 192.168.0.1 gw 192.168.1.1 dev wlan0
# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
192.168.0.1 192.168.1.1 255.255.255.255 UGH 0 0 0
wlan0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
wlan1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
wlan0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0
wlan1
# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=63 time=158 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=63 time=168 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=63 time=162 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=63 time=170 ms
64 bytes from 192.168.0.1: icmp_seq=5 ttl=63 time=178 ms
64 bytes from 192.168.0.1: icmp_seq=6 ttl=63 time=166 ms
64 bytes from 192.168.0.1: icmp_seq=7 ttl=63 time=166 ms
64 bytes from 192.168.0.1: icmp_seq=8 ttl=63 time=155 ms
64 bytes from 192.168.0.1: icmp_seq=9 ttl=63 time=434 ms
64 bytes from 192.168.0.1: icmp_seq=10 ttl=63 time=154 ms
64 bytes from 192.168.0.1: icmp_seq=11 ttl=63 time=174 ms
64 bytes from 192.168.0.1: icmp_seq=12 ttl=63 time=161 ms
64 bytes from 192.168.0.1: icmp_seq=13 ttl=63 time=147 ms
64 bytes from 192.168.0.1: icmp_seq=14 ttl=63 time=170 ms
64 bytes from 192.168.0.1: icmp_seq=15 ttl=63 time=161 ms
64 bytes from 192.168.0.1: icmp_seq=16 ttl=63 time=190 ms
64 bytes from 192.168.0.1: icmp_seq=17 ttl=63 time=218 ms
64 bytes from 192.168.0.1: icmp_seq=18 ttl=63 time=166 ms
64 bytes from 192.168.0.1: icmp_seq=19 ttl=63 time=514 ms
64 bytes from 192.168.0.1: icmp_seq=20 ttl=63 time=177 ms
64 bytes from 192.168.0.1: icmp_seq=21 ttl=63 time=144 ms
64 bytes from 192.168.0.1: icmp_seq=22 ttl=63 time=191 ms
64 bytes from 192.168.0.1: icmp_seq=23 ttl=63 time=175 ms
64 bytes from 192.168.0.1: icmp_seq=24 ttl=63 time=156 ms
64 bytes from 192.168.0.1: icmp_seq=25 ttl=63 time=947 ms
64 bytes from 192.168.0.1: icmp_seq=26 ttl=63 time=1833 ms
64 bytes from 192.168.0.1: icmp_seq=27 ttl=63 time=2196 ms
64 bytes from 192.168.0.1: icmp_seq=28 ttl=63 time=1542 ms
64 bytes from 192.168.0.1: icmp_seq=29 ttl=63 time=816 ms
64 bytes from 192.168.0.1: icmp_seq=30 ttl=63 time=3045 ms
64 bytes from 192.168.0.1: icmp_seq=31 ttl=63 time=3181 ms
64 bytes from 192.168.0.1: icmp_seq=32 ttl=63 time=2287 ms
64 bytes from 192.168.0.1: icmp_seq=33 ttl=63 time=1496 ms
64 bytes from 192.168.0.1: icmp_seq=34 ttl=63 time=687 ms
64 bytes from 192.168.0.1: icmp_seq=35 ttl=63 time=173 ms
^C
--- 192.168.0.1 ping statistics ---
35 packets transmitted, 35 received, 0% packet loss, time 34037ms
rtt min/avg/max/mdev = 144.678/653.604/3181.758/855.953 ms, pipe 4
NOTE --- The higher ping times occurred when downloading a 39kB image file.
# route del -host 192.168.0.1 gw 192.168.1.1 dev wlan0
# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=63 time=2.37 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=63 time=2.10 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=63 time=1.96 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=63 time=2.38 ms
^C
--- 192.168.0.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 1.964/2.206/2.388/0.187 ms
I have also tried using the carl9170 driver (2010_12_02) with
compat-wireless and carl9170-fw (1.9.1-1) but I found 'iwconfig' would
segfault when it tried to display ath0.
Can somebody help me debug it further please?
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