linux-kernel - Re: 31-rc3-mmotm0716 - wonky wireless statistics..

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1248831078.3747.1117.camel@debian>
Date:	Wed, 29 Jul 2009 09:31:18 +0800
From:	Zhu Yi <yi.zhu@...el.com>
To:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>,
	Johannes Berg <johannes@...solutions.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: Re: 31-rc3-mmotm0716 - wonky wireless statistics..

On Wed, 2009-07-29 at 05:01 +0800, Valdis.Kletnieks@...edu 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/