Excesive RTT if cell flooded with AP to STA traffic

Sorin PAUN Laurentiu-Sorin.Paun at imag.fr
Thu Jul 1 13:34:29 EDT 2004


Hi all,

I'm looking at packet loss in condition of large traffic in the cell. 
I've found this interesting fact about the RTTs in the cell in some 
condition

AP, STA1 and STA2 associated.

Cell is flooded with UDP traffic, 1500B packet size, from AP to STA1.

STA2 pings the AP :

100 packets transmitted, 99 received, 1% packet loss, time 99966ms
rtt min/avg/max/mdev = 267.894/280.973/324.914/7.935 ms

Whenever, when the cell is flooded with traffic from STA1 to AP, the RTT 
get normal values:

100 packets transmitted, 100 received, +2 duplicates, 0% packet loss, 
time 99990ms
rtt min/avg/max/mdev = 2.949/8.593/31.640/5.129 ms

What you think about this 300ms RTT?

Thank youu

I'm using hostap 0.2.0 with LinkSys WPC11 cards.
-- 
________________________________________________________________________
Sorin PAUN                           mailto:Laurentiu-Sorin.Paun at imag.fr

Doctorant INPG                             http://drakkar.imag.fr/~lpaun

Laboratoire LSR-IMAG, Equipe Drakkar
681, rue de la Passerelle - BP 72          phone: (+33) (0)4 76 82 72 12
38402 St Martin d'Hères Cedex - France       fax: (+33) (0)4 76 82 72 87
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