Re: [Xen-users] xen-3.2.0 problems with time (and space)

[Massimo Mongardini <massimo.mongardini@xxxxxxxxx>]

Christopher Isip wrote:
> My solution was to set clock to jiffies, disable ntp for all domU's 
> and just run a cron job for ntpdate.  Maybe somebody else has a better 
> solution.
> Chris
>
>
>  
I also created a 0-59/5 ntpdate cron and disabled ntp to workaround this 
issue, but I don't feel this is optimal for a production env.
It seems like that my 2.6.18.8-xen has jiffies as default clocksource
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
jiffies

I wonder if I should try any other clocksource:
cat /sys/devices/system/clocksource/clocksource0/available_clocksource
jiffies tsc pit

I remember trying clock=pit while fighting for the same problem with vmware.

xm dmesg shows this:
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) Platform timer overflows in 14998 jiffies.
(XEN) Platform timer is 14.318MHz HPET

It would be interesting to understand to what extent this is affecting 
the community. (eg. Is it just me and my hardware?)
I am aware that virtualization and clock ticks are hard to conciliate 
but since the IT trends are pushing so hard to promote virtualization 
now-a-days  I personally feel that if it's not just me and few others, 
it is unacceptable for a production server to have the clock going 
berserk and having to apply workarounds that could not always be possible.
cheers
Massimo

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