[pve-devel] less cores more iops / speed

[Stefan Priebe - Profihost AG]

Am 09.11.2012 11:01, schrieb Alexandre DERUMIER:
> do you have tried fio with --numjobs option ? (I'll make more fio threads I think, maybe set it to the number of cpu you have)

Doesn't make any difference. But i'm now at 18.000 iops ;-)

> ----- Mail original -----
>
> De: "Stefan Priebe - Profihost AG" <s.priebe at profihost.ag>
> À: "Dietmar Maurer" <dietmar at proxmox.com>
> Cc: "Alexandre DERUMIER" <aderumier at odiso.com>, pve-devel at pve.proxmox.com
> Envoyé: Vendredi 9 Novembre 2012 10:06:45
> Objet: Re: [pve-devel] less cores more iops / speed
>
> I'm pinnin inside the kvm process the fio process. SO it shouldn't be a
> problem of librbd alone.
>
> Stefan
> Am 09.11.2012 09:59, schrieb Dietmar Maurer:
>>> Am 09.11.2012 09:50, schrieb Dietmar Maurer:
>>>>>> It's try to keep process on same numa node and I think it's also
>>>>>> doing some
>>>>> dynamic pinning.
>>>>>
>>>>> numad doesn't help but libvirt seems to support pinning of kvm instances.
>>>>> Maybe pve should support pinning too?
>>>>
>>>> So far I never had such problems.
>>>>
>>>> IMHO, Manual pinning is the wrong way.
>>>
>>> But doing heavy I/O with 8 Cores is much slower than with 2 Cores that can't
>>> be correct...
>>
>> What exactly is the suggestion? So far only rbd client shows such behavior?
>>