Dahdi dummy
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DAHDI Dummy
Or how to fix my PTTLink node from stuttering when I use it.
Credit: Information taken from W9CR's wiki [1]
Compiling
Raspberry PI PTTLink 1.01 systems
For PTTLink 1.01 systems PTTLink 1.01 system.
- ensure your system is up and going, with the kernel pinned per the readme
# apt-mark hold raspberrypi-kernel-headers raspberrypi-kernel
Now run the following commands:
# apt-get install gcc raspberrypi-kernel-headers make vim git # vim /usr/src/asl-dahdi-linux-2.11.1/linux/drivers/dahdi/Kbuild remove the # from the dummy file # cd /usr/src/asl-dahdi-linux-2.11.1 # make # make install # echo -e "#needed for rpi timing \ndahdi_dummy" >>/etc/modules # add it to modules.conf # modprobe dahdi_dummy # service asterisk restart
Others
To build as root:
# cd /usr/src/asl-dahdi-linux-2.11.1/linux # export MODULES_EXTRA='dahdi_dummy' # make
Loading module
Now you need to load the module into the Linux kernel for use.
# insmod /usr/src/asl-dahdi-linux-2.11.1/linux/drivers/dahdi/dahdi_dummy.ko
Verify the module is loaded along with other DAHDI dependencies
# lsmod |grep dahdi dahdi_dummy 3432 0 dahdi 229561 35 dahdi_dummy crc_ccitt 1771 1 dahdi
Configuring DAHDI
You will need to do dahdi_genconf and then dahdi_cfg. PTTLink1.01 is missing this in the service script that starts asterisk. It needs to be added.
Restart asterisk
# service asterisk restart
Run dahdi_scan to view results:
# dahdi_scan [1] active=yes alarms=UNCONFIGURED description=DAHDI_DUMMY/1 (source: HRtimer) 1 name=DAHDI_DUMMY/1 manufacturer= devicetype=DAHDI Dummy Timing location= basechan=1 totchans=0 irq=0
Verification
StPeteRpt*CLI> dahdi show status Description Alarms IRQ bpviol CRC4 DAHDI_DUMMY/1 (source: HRtimer) 1 UNCONFIGUR 0 0 0
Testing
- Before DAHDI dummy module is installed
bryan@StPeteRpt:~ $ sudo dahdi_test [sudo] password for bryan: Opened pseudo dahdi interface, measuring accuracy... 99.614% 99.594% 99.608% 99.608% 98.476% 99.638% 99.599% 99.601% 99.600% 98.450% 99.602% 99.600% 99.601% 99.600% 98.445% 99.581% 99.621% 99.605% 99.597% 98.478% 99.630% 99.579% 99.626% 99.601% 98.478% 99.630% 99.602% 99.600% 99.601% 98.446% 99.601% 99.580% ^C --- Results after 32 passes --- Best: 99.638% -- Worst: 98.445% -- Average: 99.390271% Cumulative Accuracy (not per pass): 99.967
- After insmod of DAHDI dummy module.
bryan@StPeteRpt:~ $ sudo dahdi_test Opened pseudo dahdi interface, measuring accuracy... 99.990% 99.967% 99.991% 99.992% 99.991% 99.992% 99.991% 99.991% 99.991% 99.988% 99.992% 99.991% 99.991% 99.992% 99.991% 99.991% 99.991% 99.990% 99.992% 99.991% 99.991% 99.991% 99.991% 99.991% 99.992% 99.991% 99.991% 99.992% 99.991% 99.991% 99.991% 99.991% 99.991% 99.990% 99.991% 99.992% 99.991% 99.991% 99.991% 99.991% ^C --- Results after 40 passes --- Best: 99.992% -- Worst: 99.967% -- Average: 99.990443% Cumulative Accuracy (not per pass): 99.990
- Here it is on an intel server running a pci_radio card:
root@Itchy:/home/bryan# dahdi_test Opened pseudo dahdi interface, measuring accuracy... 99.993% 99.986% 99.995% 99.992% 99.984% 99.971% 99.993% 99.990% 99.992% 99.992% 99.991% 99.990% 99.996% 99.990% 99.971% 99.954% 99.994% 99.992% 99.991% 99.995% 99.983% 99.993% 99.992% 99.992% 99.997% 99.990% 99.985% 99.995% 99.990% 99.996% 99.989% 99.993% 99.993% 99.989% 99.997% 99.989% 99.994% 99.996% 99.988% 99.993% ^C --- Results after 40 passes --- Best: 99.997% -- Worst: 99.954% -- Average: 99.989596% Cummulative Accuracy (not per pass): 99.992
- Results are identical.