Re: Xen paravirt frontend block hang

[Jeremy Fitzhardinge]

xming wrote:
> On Feb 7, 2008 5:09 AM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>   
> > xming wrote:
> >     
> > > But I do have one problem after I upgraded to xen 3.2, the 2.6.23.x domU do
> > > not boot any more and 2.6.24 does boot but will hang after cpufreq changes
> > > the frequency.
> > >
> > >       
> > Interesting.  Do you mean dom0 cpufreq frequency changes will cause the
> > domU to hang?
> >
> >     J
> >
> >     
>
> Yes, when Dom0 changes freq while domU is doing something will trigger this.
> When using "on demand" will trigger this very eassily.
>
> This is from xm top when a domU hangs:
>
>     test32 ------       4018   98.8     131072    6.4     131072
> 6.4     1    1     4516    50087    1        0   433908   300403
> 3084907223
>
> So it appers to be running (eating CPU) sometimes the state is "r"
> sometimes "-",
> but both console and network are dead.
>   

I haven't tried to repro this yet, but I suspect I won't be able to 
because all my test machines have constant_tsc.  Does CPU change TSC 
rate on processor speed changes?

   J
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