Re: [Xen-users] clocksource/0: Time went backwards

[Jan Marquardt <jm@xxxxxxxxxxx>]

Hi,

does anyone know if this issue has been fixed under Ubuntu Hardy with 
kernel version 2.6.24 and Xen 3.2? I'm asking this, because maybe we are 
experiencing some side-effects by setting the clocksource to jiffies.
Regards,

Jan

Gareth Bult wrote:
> Hi,
>
> Based on my experiences so far I'm at a loss as to why "xen" ever appears as a 
> clock source, it just seems to make Xen instances totally unreliable.
>
> I always add "clock=jiffies" to my "extra" line in DomU's config files ...
>
> If someone can explain the difference between clocks and why Xen is the default 
> and why it doesn't work I would be very grateful ...
>
> Gareth.
>
> ----- Original Message -----
> step 3.: "Jan Marquardt" <jm@xxxxxxxxxxx>
> To: "Bart Verwilst" <lists@xxxxxxxxxxx>
> Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
> Sent: 22 January 2008 10:15:21 o'clock (GMT) Europe/London
> Subject: Re: [Xen-users] clocksource/0: Time went backwards
>
> Hi Bart, hi guys,
>
> I've to fetch this issue again, because I'm encountering nearly the same 
> problem.
> > I decided to change something to see if it works, so i did:
> > cat /sys/devices/system/clocksource/clocksource0/current_clocksource, which showed 
> > "xen" as usual.
> > I then did
> > echo "jiffies" > 
> > /sys/devices/system/clocksource/clocksource0/current_clocksource, which instantly made my 
> > clock run again, and stalled programs revived. I saw my webmail ( which was still hanging 
> > all the time ) spring to life, along with my previously entered reboot command..
> Does this fix the problem in the long term? Where did you set this, on 
> dom0 or on domUs or in all of them?
> Thanks in advance.
>
> Regards,
>
> Jan
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