Package: collectd
Version: 4.3.0-2
Severity: normal
I have a problem with this new plugin to monitor my wifi signal. As it
seems, signal power or noise doesn't work for me.
signal_noise.rrd and signal_power.rrd contain exactly the same values,
which correspond probbly to real signal power (around -76 dBm).
output of iwconfig wlan0 is like:
wlan0 IEEE 802.11b ESSID:"tovar"
Mode:Managed Frequency:2.437 GHz Access Point:
00:19:5B:1D:89:8C
Bit Rate:11 Mb/s Sensitivity=1/3
Retry limit:20 RTS thr:off Fragment thr:off
Encryption key:ABC1-23CB-A1 Security mode:restricted
Power Management:off
Link Quality=21/70 Signal level=-76 dBm Noise level=-98 dBm
Rx invalid nwid:0 Rx invalid crypt:1214507 Rx invalid frag:0
Tx excessive retries:15 Invalid misc:20574539 Missed beacon:0
My colletcd.conf looks like this:
FQDNLookup true
LoadPlugin cpu
LoadPlugin df
LoadPlugin interface
LoadPlugin irq
LoadPlugin load
LoadPlugin logfile
LoadPlugin memory
LoadPlugin ping
LoadPlugin processes
LoadPlugin rrdtool
LoadPlugin sensors
LoadPlugin swap
LoadPlugin wireless
<Plugin interface>
Interface "wlan0"
IgnoreSelected false
</Plugin>
<Plugin logfile>
LogLevel "debug"
File "/var/log/collectd.log"
Timestamp true
</Plugin>
<Plugin ping>
Host "ondra.valek.net"
Host "lo4.bras2.prg.vol.cz"
Host "192.168.1.1"
</Plugin>
<Plugin rrdtool>
DataDir "/var/lib/collectd/rrd"
</Plugin> I'm happy to see this new plugin to monitor my wifi signal. But as it
seems, noise doesn't work for me.
signal_noise.rrd and signal_power.rrd contain exactly the same values,
which correspond to real signal power (around -76 dBm).
output of iwconfig wlan0 is like:
wlan0 IEEE 802.11b ESSID:"tovar"
Mode:Managed Frequency:2.437 GHz Access Point:
00:19:5B:1D:89:8C
Bit Rate:11 Mb/s Sensitivity=1/3
Retry limit:20 RTS thr:off Fragment thr:off
Encryption key:ABC1-23CB-A1 Security mode:restricted
Power Management:off
Link Quality=21/70 Signal level=-76 dBm Noise level=-98 dBm
Rx invalid nwid:0 Rx invalid crypt:1214507 Rx invalid frag:0
Tx excessive retries:15 Invalid misc:20574539 Missed beacon:0
My colletcd.conf looks like this:
FQDNLookup true
LoadPlugin cpu
LoadPlugin df
LoadPlugin interface
LoadPlugin irq
LoadPlugin load
LoadPlugin logfile
LoadPlugin memory
LoadPlugin ping
LoadPlugin processes
LoadPlugin rrdtool
LoadPlugin sensors
LoadPlugin swap
LoadPlugin wireless
<Plugin interface>
Interface "wlan0"
IgnoreSelected false
</Plugin>
<Plugin logfile>
LogLevel "debug"
File "/var/log/collectd.log"
Timestamp true
</Plugin>
<Plugin ping>
Host "ondra.valek.net"
Host "lo4.bras2.prg.vol.cz"
Host "192.168.1.1"
</Plugin>
<Plugin rrdtool>
DataDir "/var/lib/collectd/rrd"
</Plugin>
I've been digging through the source code and believe to have found the cause:
in /src/wireless.c between lines 125-141 (code parsing /proc/net/wireless):
/* power [dBm] < 0.0 */
power = strtod (fields[3], &endptr);
if (fields[3] == endptr)
power = 1.0; /* invalid */
else if ((power >= 0.0) && (power <= 100.0))
power = wireless_percent_to_power (power);
else if (power > 100.0)
power = 1.0; /* invalid */
/* noise [dBm] < 0.0 */
noise = strtod (fields[3], &endptr);
if (fields[3] == endptr)
noise = 1.0; /* invalid */
else if ((noise >= 0.0) && (noise <= 100.0))
noise = wireless_percent_to_power (noise);
else if (noise > 100.0)
noise = 1.0; /* invalid */
Both blocks of code seem to parse the same part of the line.
Unfortunately I'm not familiar with C code, compiling froum source and testing
own debian packages, therefore I haven't
included a real patch. Is there any howto for that?
Ondrej Valek
-- System Information:
Debian Release: lenny/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.15
Locale: LANG=en_US, LC_CTYPE=cs_CZ.utf8 (charmap=UTF-8) (ignored: LC_ALL set to
en_US.utf8)
Shell: /bin/sh linked to /bin/bash
Versions of packages collectd depends on:
ii debconf [debconf-2.0] 1.5.19 Debian configuration management sy
ii libc6 2.7-6 GNU C Library: Shared libraries
ii librrd2 1.2.27-1 Time-series data storage and displ
Versions of packages collectd recommends:
ii libcurl3-gnutls 7.18.0-1 Multi-protocol file transfer libra
ii libdbus-1-3 1.1.2-1 simple interprocess messaging syst
ii libhal1 0.5.10+git20080301-1 Hardware Abstraction Layer - share
ii libkrb53 1.6.dfsg.3~beta1-3 MIT Kerberos runtime libraries
ii libmysqlclient15off 5.0.51a-3 MySQL database client library
ii liboping0 0.3.5-1 C/C++ library to generate ICMP_ECH
ii libpcap0.8 0.9.8-2 System interface for user-level pa
ii libperl5.8 5.8.8-12 Shared Perl library
ii libsensors3 1:2.10.5-5 library to read temperature/voltag
ii libsnmp15 5.4.1~dfsg-6 SNMP (Simple Network Management Pr
ii libvirt0 0.4.0-6 library for interfacing with diffe
ii libxenstore3.0 3.2.0-4 Xenstore communications library fo
ii libxml2 2.6.31.dfsg-2 GNOME XML library
ii lm-sensors 1:3.0.1-2 utilities to read temperature/volt
ii perl 5.8.8-12 Larry Wall's Practical Extraction
ii rrdtool 1.2.27-1 Time-series data storage and displ
-- debconf information:
* collectd/auto-migrate-3-4: false
collectd/migration-3-4:
--
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