Re: [Xen-users] 47s clock skew in domUs every so often, Debian squeeze packaged hypervisor 4.0.1-2

[Steve Allison <stalks@xxxxxxxxxxx>]

On 21/09/2011 16:56, Andy Smith wrote:
> Hi Steven,
>
> On Wed, Sep 21, 2011 at 08:55:08AM -0500, Steven Timm wrote:
> > What's your setting for /proc/sys/xen/independent_wallclock?
> Not sure if that was for Steve or myself, but since most of the
> domUs I have access to are using pvops kernels they don't have an
> independent_wallclock setting at all.
>
> Steve,
>
> > On Wed, 21 Sep 2011, Steve Allison wrote:
> > > On 20/09/2011 22:02, Andy Smith wrote:
> > > >          Current      Available
> > > >          clocksource  clocksources
> > > > -----------------------------------
> > > > dom0   xen          xen
> > > > foo2   tsc          xen tsc
> > > > test0  xen          xen tsc jiffies
> > > > bar0   xen          xen tsc
> [...]
>
> > > Add this to /etc/default/grub
> > >
> > > GRUB_CMDLINE_XEN_DEFAULT="clocksource=pit"
> Will that actually work given that dom0 does not list "pit" as an
> available clocksource?
>
> If/when I do reboot the dom0, what should I be looking for in the xm
> dmesg and dom0 dmesg that will give some info about clock sources?
>
> Cheers,
> Andy
>
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I think dom0 will only ever list "xen" as its clocksource because of the 
type of virtual machine it is. I think to get the true clocksource 
listing you need to boot without the hypervisor.
Whilst using pit I get the following lines...

> xm dmesg|grep -i pit
(XEN) Command line: placeholder clocksource=pit
(XEN) Platform timer is 1.193MHz PIT

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