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[asterisk-users] Timer_fd, pthreads, or DAHDI timer for timing under 1.8.11.0?

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viljoens at verishare....
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Posted: Fri Feb 20, 2015 1:39 am Post subject: [asterisk-users] Timer_fd, pthreads, or DAHDI timer for timi

Hi guys I have some questions regarding the above 1. Why are there different options for timing? 2. What are the differences between these types of timing sources? 3. When should you use what? 4. Is one timer type more "reliable" for an Asterisk system under heavy loads than another while NOT using any DAHDI hardware - SIP only? I'm of course referring to the familiar "spamming timer_fd error messages in the CLI with increasing load until asterisk crashes" phenomenon. Using 1.8.11.0 on Centos 6.5 Any thoughts appreciated! Thank you Stefan -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users

jcolp at digium.com
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Posted: Fri Feb 20, 2015 8:33 am Post subject: [asterisk-users] Timer_fd, pthreads, or DAHDI timer for timi

Stefan Viljoen wrote:

Quote:

Hi guys

I have some questions regarding the above

1. Why are there different options for timing?

Some systems don't have timerfd, some systems don't have DAHDI. The goal
is to have at least some sort of timing module for every system.

Quote:

2. What are the differences between these types of timing sources?

Timerfd uses an interface provided by the kernel for reliable timing.
DAHDI uses the timing provided by a physical card. pthread emulates a
timing source by using some wait logic. kqueue is for OSX systems.

Quote:

3. When should you use what?

timerfd > DAHDI > pthread.

Quote:

4. Is one timer type more "reliable" for an Asterisk system under heavy
loads than another while NOT using any DAHDI hardware - SIP only?

timerfd will always be more reliable than pthread.

Quote:

I'm of course referring to the familiar "spamming timer_fd error messages in
the CLI with increasing load until asterisk crashes" phenomenon.

A change was done over 2 years ago[1] to stop this spamming from
occurring. An issue[2] remains open, though, as the underlying reason
for the failure was not isolated.

[1] http://svnview.digium.com/svn/asterisk/branches/?view=log&pathrev=375893
[2] https://issues.asterisk.org/jira/browse/ASTERISK-20032

--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

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