[ntp:questions] Atom PPS with parallel port
nomail at example.com
Sun Feb 23 23:18:00 UTC 2014
Chris Adams <cma at cmadams.net> wrote:
>>I further studied the matter and found that on the CentOS 6.5 system
>>where I first checked the kernel is at 2.6.32 and the pps_parport module
>>is not yet included.
> When I ran this on a CentOS system, I didn't use the in-kernel PPS. I
> used the shmpps daemon from EPEL instead (user-space daemon, so not
> quite as accurate).
Sure, on my own system I use an old gpsd in which I included a user-space
PPS daemon which works quite well, but for this purpose we can use all
accuracy we can get. Timestamping in the IRQ handler is probably a lot
better than in a user process.
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