[pve-devel] pve-kernel from repos more recent that proxmox git ?

[Stefan Priebe]

D

Am 09.04.2012 um 16:41 schrieb Alexandre DERUMIER <aderumier at odiso.com>:

>>> I guess that has serious disadvantages? 
> 
> Don't really know. I think it's only use if we are really low in memory.
> Trying to defrag to have some more hugepages free.
> And with ksm in the game, I don't really know all they are interacting together.
> 
> 
>>> Maybe a stupid question, but can't we enable that only for KVM processes? 
> I don't think it's possible. It's enable for the whole system.
Did I miss an email? It what case we don't want huge pages? The redhat optimization contains some good informations why we want hugepages with kvm.

> 
> 
> 
> Maybe can we simply add an option in proxmox to define if user want use or not hugepage ?
> 
> (put in an init.d by example an "echo never|always > /sys/kernel/mm/redhat_transparent_hugepage/enabled")
> 
> 
> ----- Mail original ----- 
> 
> De: "Dietmar Maurer" <dietmar at proxmox.com> 
> À: "Alexandre DERUMIER" <aderumier at odiso.com>, pve-devel at pve.proxmox.com 
> Envoyé: Lundi 9 Avril 2012 15:48:26 
> Objet: RE: [pve-devel] pve-kernel from repos more recent that proxmox git ? 
> 
>> differents threads reports that disable defrag is enough as workaround 
>> 
>> echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag 
> 
> I guess that has serious disadvantages? 
> 
>> Transparent hugepages is a great benefits for virtual machine with lot of 
>> memory,or doing a lot of memory access like databases. 
> 
> Maybe a stupid question, but can't we enable that only for KVM processes? 
> 
> - Dietmar 
> 
> 
> 
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> 
>    Alexandre D erumier 
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