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Re: [gpsd-dev] Mysteriously vanishing bugs don't make me happy

From: Gary E. Miller
Subject: Re: [gpsd-dev] Mysteriously vanishing bugs don't make me happy
Date: Mon, 4 Nov 2013 15:00:54 -0800

Yo Greg!

On Mon, 04 Nov 2013 16:14:27 -0500
Greg Troxel <address@hidden> wrote:

> Have people been seeing jitter low enough that microsecond
> quantization looks like a real issue?

Yes.  I now see +/- 400 nSec jitter on chrony socket.  I could do better
on a dedicated time server.  Best I can do with SHM is currently about
+/- 2 uSec.

> What kind of clock stability
> and sync hardware does it take to get to that point?

I have a SiRF III, and KPPS on an eight core Xeon server ruinning irqbalance.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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