wifi bit rate

[JD]

On 05/21/2012 03:31 PM, Rick Stevens wrote:
> On 05/21/2012 02:52 PM, Konstantin Svist wrote:
>> On 05/21/2012 02:33 PM, JD wrote:
>>> On 05/21/2012 01:34 PM, Konstantin Svist wrote:
>>>> On 05/21/2012 01:18 PM, JD wrote:
>>>>> Any wifi protocol savvy people who can explain this:
>>>>>
>>>>> iwconfig wlan0
>>>>> wlan0 IEEE 802.11bgn ESSID:"Private"
>>>>> Mode:Managed Frequency:2.452 GHz Access Point: 00:AA:BB:CC:DD:EE
>>>>> Bit Rate=18 Mb/s Tx-Power=27 dBm
>>>>> Retry long limit:7 RTS thr=2346 B Fragment thr=2346 B
>>>>> Power Management:off
>>>>> Link Quality=70/70 Signal level=-36 dBm
>>>>> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
>>>>> Tx excessive retries:0 Invalid misc:25 Missed beacon:0
>>>>>
>>>>> The access point is a 54G wifi gateway and router.
>>>>>
>>>>> My wifi card is the Atheros AR5008 which is an 802.11n card.
>>>>>
>>>>> How could the bit rate be restricted to 18Mb/s??
>>>>> Is this a problem with the ath9k driver or the wext driver?
>>>>> PS: I did not have the issue until installing FC16. This
>>>>> problem was absent in FC14.
>>>>>
>>>>
>>>> I thought wifi adjusts the data rate on the fly based on how strong
>>>> the signal is. Try moving the laptop closer to the router, at least
>>>> just to see if the rate goes up...
>>>>
>>> No difference!!
>>> Stuck at 18mb/s
>>>
>>> By the way: I changed wifi interface on my machine to an rtl8187
>>> and still iwconfig reports 18mb/s, with full signal quality at 70/70 
>>> !!!
>>>
>>> # iwconfig wlan1
>>> wlan1 IEEE 802.11bg ESSID:"Private"
>>> Mode:Managed Frequency:2.452 GHz Access Point: 00:AA:BB:CC:DD:EE
>>> Bit Rate=18 Mb/s Tx-Power=20 dBm
>>> Retry long limit:7 RTS thr=2346 B Fragment thr=2346 B
>>> Power Management:off
>>> Link Quality=70/70 Signal level=-25 dBm
>>> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
>>> Tx excessive retries:0 Invalid misc:21 Missed beacon:0
>>>
>>>
>>
>> Hm, you're right - the quality is out of 70 and the rate is really low..
>> here's mine:
>> wlan0 IEEE 802.11abgn ESSID:"Redacted"
>> Mode:Managed Frequency:2.412 GHz Access Point: 00:14:D1:C4:4C:3F
>> Bit Rate=1 Mb/s Tx-Power=14 dBm
>> Retry long limit:7 RTS thr:off Fragment thr:off
>> Power Management:off
>> Link Quality=62/70 Signal level=-48 dBm
>> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
>> Tx excessive retries:1 Invalid misc:20 Missed beacon:0
>>
>> Maybe it's because I'm also connected over ethernet, so wifi is not
>> being used, so it's in powersaving mode of some kind..?
>> See if your rate goes up/down if you're actively transferring a bunch of
>> data.
>
> My laptop is using a wired connection currentl, but the wireless
> shows...
>
> wlan0     IEEE 802.11bgn  ESSID:"myessid"
>           Mode:Managed  Frequency:2.462 GHz  Access Point: 
> 98:FC:11:4A:89:56
>           Bit Rate=72.2 Mb/s   Tx-Power=15 dBm
>           Retry  long limit:7   RTS thr:off   Fragment thr:off
>           Encryption key:off
>           Power Management:off
>           Link Quality=63/70  Signal level=-47 dBm
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:0  Invalid misc:65   Missed beacon:0
>
> My guess is it's the signal strength. Note mine is at -47dBm, the OP's
> was at -36dBm.
>
>>
>
>
I think that perhaps iwconfig might be broken,
or one or both of the drivers ( ath9k and or wext)
may be providing wrong info to whatever syscall iwconfig
is using to obtain the info.
When I take my laptop to starbucks or McDonalds hot spot,
even when sitting outside, bitrate never is below 54mbps,
sometime is as high as 72mb/s