Re: [Xen-devel] Time in Xen

[Nicolas Bougues <nbougues-listes@xxxxxxxxxxx>]

On Fri, Oct 17, 2003 at 09:39:37AM +0100, Keir Fraser wrote:
> > I have a strange problem. One of my various xen test boxes doesn't
> > accept to set its time. Basically, it's stuck to RTC time.
> > 
> > ntpdate, date, hwclock all "seem" to work, but they don't actually
> > change the system time. The only way I have to change it right now is
> > to change it in the BIOS, which is not a good thing.
> > 
> > Since I heavily "stripped down" the Debian version on this box, maybe
> > I broke something somewhere.
> 
> Sadly, settimeofday is broken :-(
>  

Well, yes, actually I just realized that it doesn't work anywhere.

I noticed that in arch/xeno/kernel/time.c, do_settimeofday() has a #if
0 which prevents it from doing anything.

> > While I'm trying to debug how settimeofday() syscall work, I'm
> > wondering if there is some cross-domain time synchronization : are
> > they always in perfect sync, or should I run some kind of ntp stuff in
> > each subdomain ? Or only domain 0 would be enough ?
> 
> If settimeofday in domain 0 would update the RTC via Xen, then that
> would be adequate. All other domains automatically remain synchronized
> with the RTC.
> 

By RTC, you mean the hardware RTC ? Doesn't xen maintain a system time
on its own ?

As long as xen system time is settable via a domain 0 user tool
(ntp-alike), I don't really care about the hardware RTC.

-- 
Nicolas Bougues
Axialys Interactive


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