Re: 31-rc3-mmotm0716 - wonky wireless statistics..
From: Zhu Yi
Date: Tue Jul 28 2009 - 21:31:30 EST
On Wed, 2009-07-29 at 05:01 +0800, Valdis.Kletnieks@xxxxxx wrote:
> Dell Latitude D820 laptop, lspci reports the network card as:
>
> 0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Netwo rk Connection (rev 02)
>
> iwlwifi driver in use, card associated via wpa_supplicant but not being
> actively used
>
> # iwconfig
> wlan0 IEEE 802.11abg ESSID:"VT-Wireless"
> Mode:Managed Frequency:2.447 GHz Access Point: 00:11:20:A4:4C:10
> Bit Rate=54 Mb/s Tx-Power=15 dBm
> Retry long limit:7 RTS thr:off Fragment thr:off
> Encryption key:<lopped out> [2]
> Link Quality=62/70 Signal level=-48 dBm
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:0 Missed beacon:0
> # cat /proc/net/wireless
> Inter-| sta-| Quality | Discarded packets | Missed | WE
> face | tus | link level noise | nwid crypt frag retry misc | beacon | 22
> wlan0: 0000 63. -47. -256 0 0 0 0 0 0
> wlan1: 0000 0 0 0 0 0 0 0 0 0
> wlan2: 0000 0 0 0 0 0 0 0 0 0
>
> Where did that -256 for "noise" come from? It ends up confusing the
> gkrellm-wifi plugin, it reports a S/N of 219dB ;)
This should be related to http://git.kernel.org/?p=linux/kernel/git/linville/wireless-testing.git;a=commit;h=fdb897ea5c77836f890033d563336ab0c94c9222
But I don't think this is an ABI broken. User space should parse the
trailing '.' to see if a field is updated or not because there are cards
not capable to report hardware noise level anyway. Johannes?
Thanks,
-yi
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