hostapd-1-rc3: Wireless lags and unstable connection

Valeriy Kucherenko darkside_ua at ukr.net
Thu Apr 26 13:02:25 EDT 2012


Loaded clean Ubuntu Desktop 11.10 via PXE on same notebook. The test shows ping from 2ms to 10ms and again there was few spikes total of 200ms each 1 minute 10 seconds. I have also checked my crontab - there is nothing that can execute each minute.

After that I have installed latest Intel PROSet drivers and noticed that average ping dropped from 3-5ms to 1-4ms, but those spikes each 1m 10s still present.

I have a question to all: does anyone else experiencing such problem?

P.S.
As I remember there was some problems a time ago with hostapd (EAPOL timeout) and Intel cards. It is possible, that there is some unresolved "tail" left with them? Because my HTC Incredible S (that doesn't have any Intel wi-fi) does not show any ping spikes.


> What is PS mode? 
> It's in normal mode and I'm interacting with them while testing.
> 
> Interesting news. 
> I just connected my Android phone to AP and start pinging both Win7 client and Phone client. So, ping to phone is clear and shows 2-3ms without any spikes, but the Win7 client show spikes every 1 minute 10 sec.
> Then, I have turned phone into AP mode and connected to it with Win7 client - spikes appears same as with my Ubuntu AP.
> So, I guess the problem not with hostapd.
> Later today I'll run Ubuntu Desktop via PXE on same notebook and check this issue again - maybe the problem in Win7 or Intel Drivers.
> 
> 
> > 2012/4/26 Valeriy Kucherenko <darkside_ua at ukr.net>:
> > > I have made some observation on those ping spikes:
> > >
> > > Time: 15:26:45
> > > 64 bytes from 192.168.0.5: icmp_req=2249 ttl=128 time=3.78 ms
> > > 64 bytes from 192.168.0.5: icmp_req=2250 ttl=128 time=112 ms
> > > 64 bytes from 192.168.0.5: icmp_req=2251 ttl=128 time=95.5 ms
> > > 64 bytes from 192.168.0.5: icmp_req=2252 ttl=128 time=597 ms
> > > 64 bytes from 192.168.0.5: icmp_req=2253 ttl=128 time=3.27 ms
> > 
> > Maybe your client is just entering PS mode here or doing a background scan?
> > 
> > Helmut
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