[pve-devel] Optimizing CPU flags

[Stefan Priebe - Profihost AG]

Am 11.02.2015 um 09:33 schrieb Dietmar Maurer:
> On 02/11/2015 08:17 AM, Stefan Priebe - Profihost AG wrote:
>>> What exactly is a fixed cluster? The admin can always add an additional
>>> node, and it is not possible to
>>> know the CPU features of new nodes in advance.
>> Sure live migration may fail - but this is also true for using the host
>> option.
> 
> That is why we do not use that as default.

Sure the optimation option shouldn't be a default as well. But it gives
you the possibility to have the maximal performance for your vms.
Currently a lot of cpu functions are missing in kvm64 mode.

Stefan

>>
>> The optimize option has the advantage that the maximum features will be
>> used for new VMs - this might also need the enforce parameter.
>>
>> Stefan
>>
>>
>>
> 
> I guess we should provide a generic way to specify defaults. I started a
> prototype
> for that some time ago:
> 
> https://git.proxmox.com/?p=qemu-defaults.git;a=summary
> 
> But this need more work until it gets useful.
>