[ntp:questions] Timing issue with Linux and kernel PPS?

David Taylor david-taylor at blueyonder.co.uk.invalid
Wed Nov 21 19:14:40 UTC 2012


On 21/11/2012 18:17, unruh wrote:
[]
> grep -r ldisc /etc/udev
> should show you if udev is at any time trying to load pps_ldisc.
> (Why it is called ldisc and why the underscore when the other one is
> pps-parport I have no idea)

grep -r ldisc /etc/udev
gives no output at all, even when run with sudo.

> Anyway, look in /etc/modprobe.conf, /etc/modules.conf, /etc/modprobe.d/*
> to see if pps_ldisc is loaded in any of those files.
> grep -r ldisc /etc/mod*

grep -r ldisc /etc/mod*
also gives no output, i.e. not found.

> Note that it should not matter anyway since you also have to use
> ldattach to attach the kernel interrupt to the pps_ldisc driver even if
> pps_ldisc is loaded as a module. And the space penalty is not exactly
> severe.

Thanks, Bill.  I hope that tells us something.
-- 
Cheers,
David
Web: http://www.satsignal.eu



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