Re: [Xen-users] Resolve "Time went backwards" problem by using jiffies as clocksource

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Jan 04, 2010 at 03:44:34AM +1100, Daniel Lam wrote:
>    Hi All - so I guess nobody has the answers to these questions?
>    Is there somewhere I can ask, perhaps the developers list?
>

Have you tried using newer Xen hypervisor?
Xen 3.4.2 is the latest stable release.

Also, did you try different dom0/domU kernel versions? 

-- Pasi

>    Daniel
>    ---------- Forwarded message ----------
>    From: Daniel Lam <[1]daniel@xxxxxxxxxxxxxxxx>
>    To: [2]xen-users@xxxxxxxxxxxxxxxxxxx
>    Date: Sat, 2 Jan 2010 17:20:12 +1100
>    Subject: [Xen-users] Resolve "Time went backwards" problem by using
>    jiffies as clocksource
>    Hi All,
>    I'm new to Xen and... Happy New Year!
>    After restarting dom-0, my dom-u prints this in console once every second,
>    [55082.616234] __ratelimit: 1503 messages suppressed
>    [55082.616234] clocksource/0: Time went backwards: ret=380ab26c53a
>    I resolved this by following the instructions in
>    "[3]http://wiki.debian.org/Xen";,
>    which is basically changing clocksource to "jiffies".
>    Now the problem has gone away, I'm wondering if somebody can help me:
>    1. Is domain-0 not able to set the system time of domain-u the root cause?
>        I can see this error in console "Unable to set System Clock to: <a
>    datetime value>",
>        even after I changed clocksource to "jiffies".
>    2. Why can't domain-0 set the date of the domain-u?
>    3. If this is the only way to go (using jiffies clocksource), I will have
>    to sync
>        the domain-u system time manually using something like ntpd?
>    Thanks!
>    cheers,
>    Daniel
> 
> References
> 
>    Visible links
>    1. mailto:daniel@xxxxxxxxxxxxxxxx
>    2. mailto:xen-users@xxxxxxxxxxxxxxxxxxx
>    3. http://wiki.debian.org/Xen

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