[ntp:questions] Reference clock driver for /dev/rtc

Rob nomail at example.com
Sat Jun 26 15:50:35 UTC 2010

unruh <unruh at wormhole.physics.ubc.ca> wrote:
>  The VM is liable to have large and violent
> timing swings, sometimes loosing may ticks ( and probably regularly
> exceeding the 500PPM that ntp handles) with the VM clock
> rate with respect to real time fluctuating wildly. That is NOT a
> situation ntp is designed to handle. Overloading /dev/rtc to deliver the
> underlying system time to ntpwhich then tries to discipline the unruly
> VM system time does not seem to me to be the right approach. But maybe
> your VM is more well behaved than I am imagining it to be.

You seem to forget that virtualization is not happening at the OS
system call or device driver level, but at the level of hardware.

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