[pve-devel] less cores more iops / speed

[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)




----- 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? 
>