Re: [Xen-devel] Redhat 6 VM crash on Xen when cpu number reaches 64

["Ouyangzhaowei (Charles)" <ouyangzhaowei@xxxxxxxxxx>]

>> Hi all:
>>
>> Now a days, we tested Redhat 6.2(6.4) on Xen(version 4.1.2).
>> If we config the cpu number more than 32, it'll show 32 in
>> the VM, and if we config it 64 cpus, the VM will crash and
>> the log is list below.
>>
>> Can someone tell us why is this happening?
>
> Old RHEL6 kernels don't have support for VCPU info placement for PVHVM
> (VCPUOP_register_vcpu_info call) so only 32 VCPUs are supported. This is
> fixed in current 6.6.z kernel.
>

Hi Vitaly,

Is there any official announcement of this on Redhat website?
We did not find any explanation about this, can you help us to find it?

thanks very much

>>
>> thanks
>>
>> ===============================crash log=================================
>> CPU: CPU feature rdtscp disabled on xen guest
>> CPU: CPU feature constant_tsc disabled on xen guest
>> mce: CPU supports 0 MCE banks
>>  #32
>> CPU32: Stuck ??
>>  #33
>> CPU33: Stuck ??
>
> ...
>
> --
>  Vitaly


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