[ovirt-users] vms stucked after migrate from 4.1.0 to 4.1.1 host

[Jiri Slezka]

On 03/28/2017 05:04 PM, Jiří Sléžka wrote:
> On 03/28/2017 01:50 PM, Michal Skrivanek wrote:
>>
>>> On 28 Mar 2017, at 13:41, Jiří Sléžka <jiri.slezka at slu.cz> wrote:
>>>
>>> On 03/28/2017 12:34 AM, Jiří Sléžka wrote:
>>>> Hi all,
>>>>
>>>> I have just upgraded ovirt manager from 4.1.0 to 4.1.1, then I have
>>>> upgraded one host. After reboot and activation of this host some vms
>>>> started to migrate here.
>>>>
>>>> Some time after migration CPU of this vms go to 100% and vms become
>>>> unreachable.
>>>>
>>>> There is /var/log/libvirt/qemu/hypnos.log (hypnos is one of this vms)
>>>> https://pastebin.com/U30xfBMJ
>>>>
>>>> Powering off and starting again solve this but I would like to have a
>>>> glue what is happening.
>>>>
>>>> I suspect this line
>>>>
>>>> 2017-03-27T22:09:23.746710Z qemu-kvm: warning: TSC frequency mismatch
>>>> between VM (2600031 kHz) and host (2100024 kHz), and TSC scaling unavailable
>>>>
>>>> Original host uses "AMD Opteron(TM) Processor 6238" with "cpu MHz:
>>>> 2600.113" and upgraded host uses "AMD Opteron(tm) Processor 6172" with
>>>> "cpu MHz: 2100.097".
>>>
>>> It looks like it isn't problem with 4.1.1 at all.
>>>
>>> There is just missing tsc_scale cpu flag on our older AMD CPUs...
>>>
>>> http://unix.stackexchange.com/questions/296636/100-cpu-utilisation-and-hang-after-virsh-migrate
>>>
>>> This is probably unsolvable hw problem, right?
>>
>> And this is without host-model CPU type?
>> That 6172 should be Opteron G3…is that what you have set in your Cluster?
> 
> Yes, Cluster CPU type is set to AMD Opteron G3. 6172 should be G3 (we
> have 3 of 4 hosts in this cluster with 6172 CPU), 6238 is probably G4
> but forced (I hoped) to G3.
> 
> Problem occurs only when migrating from 6238 CPU to 6172.

maybe the question should be:

Should setting "Cluster CPU type" to "AMD Opteron G3" filter out
tsc_scale cpu flag on newer AMD CPUs?

I hope so. Is it correct?

Cheers, Jiri


> 
> Cheers,
> 
> Jiri
> 
>>
>> Thanks,
>> michal
>>
>>>
>>> Cheers,
>>>
>>> Jiri
>>>
>>>>
>>>> Cheers,
>>>>
>>>> Jiri
>>>>
>>>>
>>>>
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>>>
>>>
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> 
> 
> 
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