Any idea ?
>Hi all,
>
>I am encountering a periodic (each 1 second) Wi-Fi transmission speed drop (from 54Mbps to 6Mbps) during an iperf between two mesh portals.
>The speed stays stuck to 6Mbps during about 300ms and then recovers its 54Mbps rate. About 1 second later this happen again.
>
>The Wi-Fi speed drops from 54Mbps to 6Mbps without any intermediate speed nor frame loss.
>
>My channel is clear from any other Wi-Fi devices disturbances.
>
>My system is as follow :
> __ _ __ _
> 192.168.2.41 [__]|=| Wireless devices [__]|=| 192.168.2.38
> 1c:75:08:0b:76:52 /::/|_| are close to each /::/|_| 08:00:27:6e:54:11
> | other (about 15cm) ^
> Ethernet| | Ethernet
> | |_|_| |_|_| |
> '---->[____?] [____?]-----'
> Mesh Portal Mesh Portal
> 90:A4:DE:21:4F:11 00:1B:B1:58:F6:DD
>
>Kernel : 2.6.33.7
>Compat Wireless : 2012-06-14
>Radio chipset : AR9160 (ath9k)
>
>Please find attached a wireshark wireless trace of the drop itself (between packets 6 and 7).
>
>Can you give me some clue how to work it out ?
>Thanks in advance,
>
>Best regards,
>
>C?dric DEBARGE
Hi Cedric,
On Mon, Sep 24, 2012 at 5:57 AM, Cedric Debarge
<[email protected]> wrote:
>>I am encountering a periodic (each 1 second) Wi-Fi transmission speed drop (from 54Mbps to 6Mbps) during an iperf between two mesh portals.
>>The speed stays stuck to 6Mbps during about 300ms and then recovers its 54Mbps rate. About 1 second later this happen again.
This looks like a regression we had where peer rates were
re-initialized on each beacon and was fixed in
bae35d92b6a1b6fd8c699415ab90aeeea2a56bc3 "mac80211: don't re-init rate
control when receiving mesh beacon". You should be able to find this
fix in compat-wireless since 8/23.
Thomas