I'm interested in using the testing a non-DAHDI timing source to have some 
assurance I'm on a system that's not likely to give me grief over 
timing-related issues.

I'm familiar with dahdi_test and the guideline of needing 99.975% accuracy for 
reliable conferencing and such.  (Is that an accurate guideline?  Where did it 
come from?)

When I started looking at using the timerfd timing source instead, it seemed 
the "timing test" command was my go-to for checking it, but I'm not sure it's 
testing the timing source at the same level dahdi_test did, as it's only 
testing 50 ticks per second?  How much do I really need?  Is it worthwhile to 
go up to "timing test 1024" to match?

Would really love an authoritative answer to this question, or at least a 
direction to go in to figure this one out myself.

I tried asking this question on Server Fault first, by the way--if anyone wants 
the rep for answering it there, here's the link: 
http://serverfault.com/questions/517556/interpreting-and-using-the-asterisk-timing-test-command

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