From: Zhu Yi <yi.zhu@intel.com>
To: "Valdis.Kletnieks@vt.edu" <Valdis.Kletnieks@vt.edu>,
Johannes Berg <johannes@sipsolutions.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: 31-rc3-mmotm0716 - wonky wireless statistics..
Date: Wed, 29 Jul 2009 09:31:18 +0800 [thread overview]
Message-ID: <1248831078.3747.1117.camel@debian> (raw)
In-Reply-To: <5934.1248814870@turing-police.cc.vt.edu>
On Wed, 2009-07-29 at 05:01 +0800, Valdis.Kletnieks@vt.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
next prev parent reply other threads:[~2009-07-29 1:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-28 21:01 31-rc3-mmotm0716 - wonky wireless statistics Valdis.Kletnieks
2009-07-29 1:31 ` Zhu Yi [this message]
2009-07-29 7:19 ` Johannes Berg
2009-08-04 3:40 ` Valdis.Kletnieks
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