hostapd-1-rc3: Wireless lags and unstable connection

Bjarke Istrup Pedersen gurli at gurlinet.dk
Thu Apr 26 06:36:45 EDT 2012


2012/4/26 Valeriy Kucherenko <darkside_ua at ukr.net>:
>
>
> Hi.
>
> I'm currently using hostapd-1-rc3 and have noticed periodic connection lags that causes problems when, for example, playing online games or listening to streaming music.
> Here is a part of ping output (from AP to wireless client) when the lag appears:
>
> 64 bytes from 192.168.0.5: icmp_req=869 ttl=128 time=2.38 ms
> 64 bytes from 192.168.0.5: icmp_req=870 ttl=128 time=6.79 ms
> 64 bytes from 192.168.0.5: icmp_req=871 ttl=128 time=3059 ms  <-- here it is
> 64 bytes from 192.168.0.5: icmp_req=872 ttl=128 time=2053 ms
> 64 bytes from 192.168.0.5: icmp_req=873 ttl=128 time=1046 ms
> 64 bytes from 192.168.0.5: icmp_req=874 ttl=128 time=38.9 ms
> 64 bytes from 192.168.0.5: icmp_req=875 ttl=128 time=4.51 ms
> 64 bytes from 192.168.0.5: icmp_req=876 ttl=128 time=5.90 ms
>
> These lags occurs approximately each 10 minutes and I'm guess that the problem in WPA group rekeing routine (I have set wpa_group_rekey=600 in my config).

Could you try and play around with that setting (like setting it to
150 and 300, and see if the problem happens with 2,5 and 5 minute
intervals?

Would help pinpoint what is causing it.

Also, did it happen in rc2?

/Bjarke

> I'll try to provide as more info on this problem as I can, so here it is:
>
> hostapd build ".config" file with my comments on some options - http://pastebin.com/0j5f6f9D
> hostapd.conf - http://pastebin.com/9vwiDCbB
> hostapd debug output - http://pastebin.com/mCnB226v
>
> AP OS details:
> Linux 3.0.0-17-generic #30-Ubuntu SMP Thu Mar 8 17:34:21 UTC 2012 i686 i686 i386 GNU/Linux without any compat-wireless compiled
> Load average: 0.01, 0.03, 0.05
> Wireless card: AR922X Wireless Network Adapter (TP-Link TL-WN851N)
>
> Client OS details:
> Dell XPS-L501X, Windows 7 Pro x64
> Wireless card: Intel Centrino Advanced-N 6200 AGN
> Drivers: Intel PROSet/Wireless 13.5.0.6
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