>>One VM on one Host: 18.000 IOP/s >>Two VM on one Host: 2x11.000 IOP/s >>Three VM on one Host: 3x7.000 IOP/s
And host cpu is 100% ? ----- Mail original ----- De: "Stefan Priebe - Profihost AG" <[email protected]> À: "Alexandre DERUMIER" <[email protected]> Cc: "eric" <[email protected]>, [email protected] Envoyé: Lundi 12 Novembre 2012 12:58:35 Objet: Re: [pve-devel] less cores more iops / speed Am 12.11.2012 08:51, schrieb Alexandre DERUMIER: >>> Right now RBD in KVM is limited by CPU speed. > > Good to known, so it's seem lack of threading, or maybe somes locks. (so > faster cpu give more iops). > > If you lauch parallel fio on same host on different guest, do you get more > total iops ? (for me it's scale) One VM on one Host: 18.000 IOP/s Two VM on one Host: 2x11.000 IOP/s Three VM on one Host: 3x7.000 IOP/s > if you launch 2 parallel fio, on same guest (on differents disk), do you get > more iops ? (for me, it doesn't scale, so raid0 in guest doesn't help). No it doesn't scale. Stefan > ----- Mail original ----- > > De: "Stefan Priebe" <[email protected]> > À: "Alexandre DERUMIER" <[email protected]> > Cc: "eric" <[email protected]>, [email protected] > Envoyé: Dimanche 11 Novembre 2012 13:07:36 > Objet: Re: [pve-devel] less cores more iops / speed > > Am 11.11.2012 12:12, schrieb Alexandre DERUMIER: >> If I remember good, stefan can achieve 100.000 iops with iscsi with same kvm >> host. > > Correct but this was always with scsi-generic and I/O multipathing on > host. rbd does not support scsi-generic ;-( > >> I have checked ceph mailing, stefan seem to have resolved his problem with >> dual core with bios update ! > Correct. So speed on Dual Xeon is now 14.000 IOP/s and 18.000 IOP/s on > Single Xeon. But the difference is an issue of the CPU Speed. 3,6Ghz > Single Xeon vs. 2.5Ghz Dual Xeon. > > Right now RBD in KVM is limited by CPU speed. > > Greets, > Stefan >
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