[Asterisk-Users] Cheap Time sources which is best?

[Steve Gladden]

>>> What does zttest tell you?

Well on the 2.4 box it tells me (see below output).
I've not really found any documentation on zttest on what is good or
what is bad so at this point the numbers don't mean much.
Also curiously enough (zttest) is not available on the 2.6 kernel system
Both systems are latest CVS-HEAD just freshly compiled/installed and running.

For whatever reason zttest is not included in the build when done on our
2.6 kernel box.
It's in the source code but no binary was compiled and installed.
So I don't even have the other box to compare to right now. :-( sadness!
Actual in-use performance on both boxes seems to be great...
Typically have 2 or 3 simultaneous G711u calls going on and a couple
gsm calls average of 5 calls going on....
at times add several voicemail sessions and a meetme.

zztest output from 2.4 kernel box to follow:

Steve
-----------------------------------------------------------------
Opened pseudo zap interface, measuring accuracy...
99.987793% 99.975586% 99.975586% 99.975586% 99.975586% 99.975586% 99.975586%
99.975586% 99.975586% 99.975586% 99.975586% 99.975586% 99.975586%
99.975586% 99.975586%
99.975586% 99.975586% 99.975586% 99.975586% 99.975586% 99.975586%
99.975586% 99.975586%
99.975586% 99.975586% 99.975586% 99.975586% 99.975586% 99.975586%
99.975586% 99.975586%
99.975586% 99.975586% 99.975586% 99.975586% 99.975586% 99.975586%
99.975586% 99.975586%
99.975586% 99.975586% 99.975586% 99.987793% 99.975586% 99.975586%
99.975586% 99.975586%
99.975586% 99.975586%
--- Results after 49 passes ---
Best: 99.987793 -- Worst: 99.975586



------------------------------------------------------------------


> On Sat, Sep 24, 2005 at 10:23:42PM -0400, Steve Gladden wrote:
>> On the same P2 450Mhz box.....
>>
>> I have tried both UHCI usb on a 2.4 kernel
>> and enhanced RTC on a 2.6 kernel.
>> Have not tried UHCI USB on a 2.6 kernel as of yet.
>>
>> Both seem to work GREAT.
>>
>> I have read in many places to be sure to use a digium card as a time
>> source
>> and not to reply on the cheap solutions.
>
> What does zttest tell you?
>
> How good is it as a diagnostic tool? What can it tell me?
>
>>
>> However I have regular meetme sessions of 5 and 6 people at the same
>> time
>> that frequently go on for an hour or so and we have not noticed any
>> problems yet.
>>
>> I'd like to know 'what is better' the enhanced RTC or UHCI-USB.
>
> RTC, I figure. The USB code is just a hack. However the 2.6 kernel has
> some on-going work regarding timers.
>
>> and at what point do you start to need a digium board for timing?
>>
>> Seems that for even a low volume production system that I have not
>> needed
>> a recommended timing source yet.
>>
>> Thank you for your insight!
>
> --
> Tzafrir Cohen         | tzafrir at jbr.cohens.org.il | VIM is
> http://tzafrir.org.il |                           | a Mutt's
> tzafrir at cohens.org.il |                           |  best
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