Am 09.11.2012 11:10, schrieb Alexandre DERUMIER:
Doesn't make any difference. But i'm now at 18.000 iops ;-)
Read and writes ? do you have found your write cpu problem ?
Yes. CPU Load in Ceph for rand. 4k writes can be dropped by 50% when
disabling all debug setting (see my last post on ceph mailinglist).
Stefan
----- Mail original -----
De: "Stefan Priebe - Profihost AG" <[email protected]>
À: "Alexandre DERUMIER" <[email protected]>
Cc: [email protected], "Dietmar Maurer" <[email protected]>
Envoyé: Vendredi 9 Novembre 2012 11:08:18
Objet: Re: [pve-devel] less cores more iops / speed
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" <[email protected]>
À: "Dietmar Maurer" <[email protected]>
Cc: "Alexandre DERUMIER" <[email protected]>, [email protected]
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?
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