perfSONAR User Q&A and Other Discussion

[Steven Wallace <>]

My use case is unlikely to have access to GPS and/or CDMA signal. Probably 
NTP and a percision RTC (e.g., DS3231).

ssw


> On Sep 9, 2016, at 1:06 AM, Dale W. Carder 
> <>
>  wrote:
> 
> 
> A beaglebone black with something like a LEA-6T would be interesting to try.
> 
> 
> Dale
> 
> Thus spake Steven Wallace 
> ()
>  on Thu, Sep 08, 2016 at 04:48:45PM -0400:
>> thanks Ian.
>> 
>> Any comments about the beaglebone? Anyone using a DS3231-based clock?
>> 
>> ssw
>> 
>> 
>>> On Sep 8, 2016, at 2:27 PM, Ian Bobbitt 
>>> <>
>>>  wrote:
>>> 
>>> On 9/8/16 11:51 AM, Steven Wallace wrote:
>>>> I realize that underpowered ARM-based platforms aren't support, but I 
>>>> wonder if anyone has experience running OWAMP on a Raspberry Pi 3 or 
>>>> similar.
>>>> 
>>>> 
>>>> if so, can you share some details such as OS, clock source, experience, 
>>>> etc.
>>>> 
>>>> thanks,
>>>> 
>>>> steve wallace
>>>> 
>>> 
>>> Steve,
>>> 
>>> A Raspberry Pi 3 should work fine for OWAMP if you only want to show 
>>> loss, but probably not appropriate to show jitter.
>>> The Pi 3 has two means of network connectivity.
>>> 
>>> 1) On-board WiFi. Pretty well known to have poor jitter performance, 
>>> especially under load or in a noisy environment. It
>>> only supports 2.4GHz, which is pretty crowded everywhere. Loss is also 
>>> pretty much a given on WiFi.
>>> 
>>> 2) On-board USB Ethernet. USB also has poor jitter performance. This is 
>>> compounded by it being shared (via on-chip hub)
>>> with the external USB ports.
>>> 
>>> Ian Bobbitt
>>