[asterisk-ss7] Poor dahdi_test results

[Ryan Crowder]

# chrt -f 99 dahdi_test -v -c 5
Opened pseudo dahdi interface, measuring accuracy...

8192 samples in 8159.824 system clock sample intervals (99.607%)
8192 samples in 8239.544 system clock sample intervals (100.580%)
8192 samples in 8159.856 system clock sample intervals (99.608%)
8192 samples in 8159.833 system clock sample intervals (99.607%)
8192 samples in 8239.856 system clock sample intervals (100.584%)
--- Results after 5 passes ---
Best: 99.608 -- Worst: 99.416 -- Average: 99.531525, Difference:
99.997346

Thanks for the help!  

-----Original Message-----
From: asterisk-ss7-bounces at lists.digium.com
[mailto:asterisk-ss7-bounces at lists.digium.com] On Behalf Of Shaun
Ruffell
Sent: Tuesday, September 20, 2011 12:31 PM
To: asterisk-ss7 at lists.digium.com
Subject: Re: [asterisk-ss7] Poor dahdi_test results

On Tue, Sep 20, 2011 at 11:38:35AM -0700, Ryan Crowder wrote:
> Do you think this error has anything to do with it?
> 
> dahdi_genconf
> /usr/sbin/dahdi_genconf: missing default group (termtype=UNKNOWN)
> It doesn't populate dahdi-channels.conf so I have to configure
> chan_dahdi.conf manually.

You can safely ignore this. There is an open issue [1] for this is
the DAHDI-Tools project on the issue tracker.

[1] https://issues.asterisk.org/jira/browse/DAHTOOL-55

> Here are the results... not really better.
> :/etc/dahdi# dahdi_test
> Opened pseudo dahdi interface, measuring accuracy...
> 99.608% 99.419% 99.608% 99.608% 99.415% 99.608% 99.415% 99.608%
> 99.608% 99.416% 99.608% 99.415% 99.608% 99.608% 99.415% 99.608%
> 99.415% 99.608% 99.608% 99.416% 99.608% 99.415% 99.608% 99.608%
> 99.415% 99.608% 99.415% 99.608% 99.608% 99.415% 99.608% 99.415% ^C
> --- Results after 32 passes ---
> Best: 99.608 -- Worst: 99.415 -- Average: 99.529880, Difference:
> 100.004770
> :/etc/dahdi# dahdi_test -v -c 5
> Opened pseudo dahdi interface, measuring accuracy...
> 
> 8192 samples in 8159.801 system clock sample intervals (99.607%)
> 8192 samples in 8159.528 system clock sample intervals (99.604%)
> 8192 samples in 8239.840 system clock sample intervals (100.584%)
> 8192 samples in 8159.856 system clock sample intervals (99.608%)
> 8192 samples in 8239.840 system clock sample intervals (100.584%)
> --- Results after 5 passes ---
> Best: 99.608 -- Worst: 99.416 -- Average: 99.530042, Difference:
> 99.997230

Interesting. This looks fine then and it's most likely a result of
the dahdi_test process not being scheduled on your system in a
timely fashion. Your cummulative timing results were 99.997% which
is good.

What do you get when you run:
	$ chrt -f 99 dahdi_test -v -c 5

That will run the dahdi_test process at the highest possible
priority.

-- 
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com & www.asterisk.org

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