[time-nuts] Comparing the BeagleBone Black & Raspberry Pi as NTP servers

[Chuck Harris]

One of those services is likely the full blown web server
that runs on the BBB to allow you to view the help pages.

-Chuck Harris

Attila Kinali wrote:
> On Sat, 21 Mar 2015 16:23:30 -0000
> "David J Taylor" <david-taylor at blueyonder.co.uk> wrote:
>
>> I've just put up my first draft of a comparison of these two popular devices
>> as NTP servers:
>>
>>    http://www.satsignal.eu/ntp/BBB-vs-RPi.html
>>
>> Comments welcomed - I know it's an imperfect test!
>
> Something is wrong here. I would expect the BBB to perform at least
> as well as the rpi (after all, the BBB has an ethernet MAC with
> IEEE1588 support, while the rpi is basically a glorified USB controller
> with attached graphics card).
>
> You are most likely running services on the BBB (network services,
> local services, cron jobs,...) that cause the high, and spikey
> cpu load, which in turn destroys your ntp performance.
>
> Also, compare your results to [1], where Dan Drown uses the
> capture/compare unit of the AM3359 to timestamp the PPS and use
> this for ntp. In [2] he tries to measure the temperature dependence
> of the BBB oscillator (not be best way, but...).
>
> 			Attila Kinali
>
>
> [1] http://blog.dan.drown.org/beaglebone-black-timer-capture-driver/
> [2] http://blog.dan.drown.org/tcxo-beaglebone-black/
>