Re: [Madwifi-users] Delay measurment

[Pavel R. <pr...@gn...>]

On Sun, 2009-04-26 at 22:07 +0200, Jacek T. wrote:
> Hello,
> I'm trying to measure delays in WLAN networks by using 2 interfaces on
> one PC (station and monitor). By sniffing (wireshark and kismet) I get
> 2 timestamps one from sending station and one from receiving in
> monitor. In my opinion 1st timestamp marks time when packet reaches
> the driver (entering queue) and 2nd marks time the packet sent. By
> comparing this times I get  about "Queue Delay + DIFS + BO +
> (Packet)".
> After making 2 experiments I get very small delays, smaller then
> theoretical calculations but I can see the difference between 802.11b
> and 802.11e  (11Mb/s).
> Can someone tell me why delay is so small or where do I make mistake?

I believe your mistake is that you didn't explain where exactly you get
those timestamps.

-- 
Regards,
Pavel Roskin