RE: [Xen-devel] xen tsc problems?

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

/me wonders if timer_mode=1 is the default for xl?
Or only for xm?

> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: Tuesday, July 13, 2010 11:48 AM
> To: Stefano Stabellini; Dan Magenheimer
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] xen tsc problems?
> 
> On 13/07/2010 18:39, "Stefano Stabellini"
> <Stefano.Stabellini@xxxxxxxxxxxxx>
> wrote:
> 
> > I started to wonder why the guest is seeing such a big tsc warp when
> xen
> > is seeing 0, so I added more tracing and eventually I found out that
> the
> > value of v->arch.hvm_vcpu.stime_offset is significantly different
> > between the two vcpus and the difference increases after the scaling.
> > Then I added timer_mode=1 to my vm config file and the problem went
> > away.
> > I think that delay_for_missed_ticks shouldn't cause tsc scew in
> > the guest.
> 
> Well, timer_mode=1 is the default and I doubt in all seriousness that
> the
> other modes get any use or testing.
> 
>  -- Keir
> 
> 
> 
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