[pve-devel] Optimizing CPU flags

[Cesar Peschiera]

Only as a idea, talking about of the kind of processor and the live
migration for get the best performance:

Maybe will be better that PVE analyze the CPU flags of each node in the
cluster, then, it will create a personalized and optimum kind of CPU with
CPU flags that the nodes have in commun, it will be very util when you want
apply live migration.

The advantages:
1) We get the best performance to processor flags level.
2) Don't matter the kind of CPU that you have, nor how many new flags have
the new processor purchased, always PVE will do the comparison and will
enabled for the VMs.
2) Live migration will work.

But the disadvantage of this strategy is: When you add PVE nodes and you
have VMs running (that if the VMs are not running, also will be very util).

Maybe this strategy can be applied correctly, but it will be in pending
changes for apply.

I think that will be the better strategy, due that don't matter the kind of
CPU that you have. Moreover, for long time i was waiting a feature of this
kind.

Best regards
Cesar

----- Original Message ----- 
From: "Alexandre DERUMIER" <aderumier at odiso.com>
To: "dietmar" <dietmar at proxmox.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Sent: Tuesday, February 17, 2015 9:31 AM
Subject: Re: [pve-devel] Optimizing CPU flags


>>>A fast workaround/hack would be to add such setting to datacenter.cfg
>
> I think also it could be great to be able to define default create values
> in datacenter.cfg
>
> (disk (virtio,scsi,...),nic (virtio,e1000,...), scsi controller
> (lsi,virtio-scsi), ...)
>
>
> ----- Mail original -----
> De: "dietmar" <dietmar at proxmox.com>
> À: "Stefan Priebe" <s.priebe at profihost.ag>, "pve-devel"
> <pve-devel at pve.proxmox.com>
> Envoyé: Mercredi 11 Février 2015 19:42:11
> Objet: Re: [pve-devel] Optimizing CPU flags
>
>> > Sure but you cannot select a cpu type as a global default in a cluster.
>> > So you have to remember that one each time.
>>
>> The suggestion was to implement that:
>> https://git.proxmox.com/?p=qemu-defaults.git;a=summary
>
> A fast workaround/hack would be to add such setting to datacenter.cfg
>
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