Re: [Xen-devel] Maximum number of vcpus for HVM?

[Lars Kurth <lars.kurth@xxxxxxxxxx>]

On 02/11/2016 06:01, "Andrew Cooper" <Andrew.Cooper3@xxxxxxxxxx> wrote:

>On 02/11/16 09:36, Juergen Gross wrote:
>> According to
>>
>> https://wiki.xenproject.org/wiki/Xen_Project_Release_Features
>>
>> HVM guests can have up to 256 vcpus. The definition in
>>
>> include/public/hvm/hvm_info_table.h:
>>
>> /* Maximum we can support with current vLAPIC ID mapping. */
>> #define HVM_MAX_VCPUS        128
>>
>> and its usage in domain_max_vcpus(d) suggests the limit is 128.
>> I guess we should update the wiki page?
>
>The wiki has been wrong for several releases now, and I have tried
>multiple times to get it corrected.
>
>Unfortunately, I don't know what the policy is on retrofitting
>corrections to official documentation like that.

Just make a change, explaining the rationale for it in the commit message

>Also, it should read "maximum configurable vcpus", not supported.  There
>is currently no formally-written support statement, and 64vcpu HVM
>guests can definitely cause 5-second watchdog timeouts in Xen under some
>circumstances.  This is why XenServer support statement is 32 vcpus.

Not sure I understand, but feel free to make a sensible proposal

Lars

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