Re: Re: XenParavirtOps wiki page updates

[Jeremy Fitzhardinge <jeremy@goop.org>]

Ferenc Wagner wrote:
> Hmm, my last data points are from the summer, but since people keep
> constantly asking on the users' list how to do this, I assumed things
> didn't change.  Back then ntpd was unable to change the domU clock, it
> was constantly drifting away from the current time.

Ah.  I've never tested it, but I've never got a bug report about it 
either.   The Xen clocksource's rate should be tuneable down to ~1ppm, 
which should be fine for ntp.

>   Also, when the
> procfs settings (like independent_wallclock) disappeared I got the
> impression that the system times are now unconditionally synced.
>   

No, the opposite - its never synced, except at domain boot.

> Probably I'm just confused and all is well now...  I'll set up and
> test this again.  Thanks for the hint!
>   

Please keep me informed.  RH has been shipping pvops kernels for a while 
now, and their stock install starts ntp.  I would have assumed that I'd 
have heard about any time sync problems by now...

    J