[ntp:questions] Which version of Linux works best?
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Thu Mar 11 22:20:24 UTC 2010
>> Modern Linux kernels don't support PPS in the sense of RFC-whateveritis.
>> There is support for an ioctl that says "wake me up when a modem signal changes".
>> gpsd uses that to provide PPS support. I don't have any data.
>I believe but am not sure, that that uses an interrupt.
I think so. But the point is that with the PPS support, the
kernel grabs a timestamp in the interrupt routine. The ioctl
stuff just wakes up the user program so it can grab the timestamp.
On a lightly loaded system, that will probably work OK. But if
the system gets busy, there will be more noise in the data.
These are my opinions, not necessarily my employer's. I hate spam.
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