Re: [chrony-dev] Slow bootup with git

[Ed W <lists@xxxxxxxxxxxxxx>]

On 25/04/2012 05:44, Håkan Johansson wrote:
> Could the measurement series be done with increasing accuracy?  And 
> also the stepping?

I guess the first step is to measure the accuracy of the interrupt?  If 
it's decent enough on a wide range of machines then perhaps we are done 
there?

I understand Miroslav's answer now though - if we read 2 data points 
then we have either 1 or 2 readings (2 if they are a second apart, 1 
reading if not ie first reading was the bug).  So this will take between 
0-2 seconds delay to read

I guess then the question is whether increased accuracy of reading is 
useful beyond 2 samples?  Remember that gaussian error bound decreases 
fairly slowly with increasing samples (1 / sqrt(n) - ?).  Is the reading 
of 8 samples actually buying us very much?

Miroslav is fantastic at answering silly theoretical questions with hard 
measured facts so hoping he will put me straight at this point!

Thanks

Ed W


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