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SubjectRe: Xen paravirt frontend block hang
xming wrote:
> On Feb 7, 2008 5:09 AM, Jeremy Fitzhardinge <jeremy@goop.org> 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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