Yo Achim! On Thu, 23 Mar 2017 20:43:22 +0100 Achim Gratz <[email protected]> wrote:
> Gary E. Miller writes:
> > Hmm, very interesting data point. That GigE is not clearly better
> > than the 100BaseT is a surprise to me.
>
> Why do you think it should be "clearly" better? The point of the GbE
> is that even when you move data around (which none of my time boxes
> do on a regular basis, at least not yet) the line will be blocked for
> shorter periods of time.
Which, paradxically, is why GigE is usually better than 100Base-T. At
the same total amount of data per second the latency could be cut by
a factor of ten.
And less latency would hopefully lead to less jitter.
> > Can the TikerBoard GigE do hardware PTP?
>
> I don't think so and ethtool only report software timestamping
> capabilities.
That nail that coffin shut. Sad, it would be a nice feeature.
> There's an RTC device, part of the PMIC. Unfortunately the 32kHz XO
> does not seem to be populated, not is there any option to power it via
> battery. It might have an internal (awful) oscillator.
Even a really bad RTC is better than any RasPi.
> It does also have an integrated GPS baseband block, interestingly
> enough.
That would be cool, prolly left over from its cell phone heritage.
> One nice thing is that it actually can be powered off from Linux. The
> rasPi shuts down, but still consumes around 110mA.
Luckily I do nothing requiring really low power. And NTP prefers always
on, and on high speed.
When you have real performance numbers, send them on so we can share.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
[email protected] Tel:+1 541 382 8588
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