Re: Differences in iwspy !!!

Folks,

 I haven't heard from anyone on this. Resending it to stress the 
importance, not just for me, but for everyone out there. 

 Look at my original email and see why the stats are not correct. Is there 
a way to validate this ? Can anyone on the list do a simple experiment and 
cross check/validate/invalidate what I am seeing. 

 Thanks in anticipation

Vikram

On Wed, 23 Nov 2005, Vikram KAUL wrote:

vkaul>Date: Wed, 23 Nov 2005 14:54:42 -0500 (Eastern Standard Time)
vkaul>From: Vikram KAUL <[email protected]>
vkaul>To: [email protected]
vkaul>Cc: [email protected]
vkaul>Subject: Differences in iwspy !!!
vkaul>
vkaul>
vkaul>Hi Folks,
vkaul>
vkaul> I have the same laptop running two different cards with two different
vkaul>drivers:
vkaul>
vkaul>eth0:  Lucent Orinoco Gold               -> "orinoco-0.15rc3" driver
vkaul>wlan0: Linksys WCF12 with pcmcia adapter -> linux-wlan-ng-0.2.2"
vkaul>
vkaul>Both belong to the same ad-hoc group and are "iwspy"ing two other nodes
vkaul>which belong to the same ad-hoc group as well. A broadcast ping with 200ms
vkaul>interval ensures 'freshness' of the iwspy measurements. Here is what I
vkaul>see:
vkaul>
vkaul>wlan0     Statistics collected:
vkaul>    00:02:2D:64:5A:55 : Quality=32/92  Signal level=-100 dBm  Noise
vkaul>level=-132 dBm
vkaul>    00:02:2D:64:5A:4B : Quality=36/92  Signal level=-96 dBm  Noise
vkaul>level=-132 dBm
vkaul>    Link/Cell/AP      : Quality=0/92  Signal level=-100 dBm  Noise
vkaul>level=-100 dBm
vkaul>    Typical/Reference : Quality:0  Signal level:0  Noise level:0
vkaul>
vkaul>eth1      Statistics collected:
vkaul>    00:02:2D:64:5A:55 : Quality=49/92  Signal level=-42 dBm  Noise
vkaul>level=-91 dBm
vkaul>    00:02:2D:64:5A:4B : Quality=56/92  Signal level=-39 dBm  Noise
vkaul>level=-95 dBm
vkaul>    Link/Cell/AP      : Quality:49/92  Signal level:-42 dBm  Noise
vkaul>level:-91 dBm
vkaul>    Typical/Reference : Quality:36/92  Signal level:-62 dBm  Noise
vkaul>level:-98 dBm
vkaul>
vkaul>Notice that the signal level and noise level are off by a very large
vkaul>margin in the two measurements.
vkaul>
vkaul>Why is that ? The measurement cards are in two adjacent slots. I am seeing
vkaul>this very consistently.
vkaul>
vkaul>I can provide more derails if anyone wanted so
vkaul>
vkaul>Thanks in advance
vkaul>
vkaul>Vikram
vkaul>
vkaul>