[Xen-devel] RE: Bizarre pv kernel ultra-high frequency rdtsc?!?

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Yes, that does indeed fix it.  Thanks very much!

Now, onward to scaling!  (Necessary when the PV kernel
boots on "tsc safe" hardware but then migrates.)

Thanks again!
Dan

> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: Saturday, November 21, 2009 2:45 PM
> To: Dan Magenheimer; Jeremy Fitzhardinge
> Cc: Xen-Devel (E-mail)
> Subject: Re: Bizarre pv kernel ultra-high frequency rdtsc?!?
> 
> 
> On 20/11/2009 23:45, "Dan Magenheimer" 
> <dan.magenheimer@xxxxxxxxxx> wrote:
> 
> > -        _u.tsc_timestamp     = t->stime_local_stamp;
> > -        _u.system_time       = t->stime_local_stamp;
> > +        _u.tsc_timestamp     = t->stime_local_stamp - BIG_OFFSET;
> > +        _u.system_time       = t->stime_local_stamp - BIG_OFFSET;
> 
> Ah, the line above is the bug. You should be subtracting 
> BIG_OFFSET from
> _u.tsc_timestamp only. Leave _u.system_time as it is. That'll 
> fix all your
> observed problems.
> 
>  -- Keir
> 
> 
>

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