Re: [pve-devel] less cores more iops / speed

[Stefan Priebe]

Am 09.11.2012 21:53, schrieb Eric Blevins:

I have been testing IOPS with Areca 1882 pcie 3.0 with SSD disks.
A single VM on my system seems to be limited to about 30K IOPS writing
and about 70K reading.
I can get more total IOPS running benchmarks on two VMs at the same time.

Xeon E5-2650 2.0Ghz 8 core

These newer Xeon with turboboost make it a little difficult to benchmark
if frequencies change all the time.
With a few teaks I got all the cores in my 2650s to run at 2.4Ghz all
the time.
Instructions here:
http://forum.proxmox.com/threads/11508-Intel-Turbo-Boost-not-working?p=63058#post63058

Thanks for this idea but it doesn't help.

Stefan

On 11/09/2012 11:02 AM, Alexandre DERUMIER wrote:

Oh great,
so it seem that you can get more ios with more vm.  (It's become interesting 
for me :)

What are you exact xeon models ? same server model,bios options ?

what happen on the dual xeon, if you shutdown some cores ?

echo 0 > /sys/devices/system/cpu/cpuX/online


also, does pining help on dual xeon ?



----- Mail original -----

De: "Stefan Priebe - Profihost AG" <s.pri...@profihost.ag>
À: "Alexandre DERUMIER" <aderum...@odiso.com>
Cc: pve-devel@pve.proxmox.com
Envoyé: Vendredi 9 Novembre 2012 16:42:09
Objet: Re: [pve-devel] less cores more iops / speed

Am 09.11.2012 15:49, schrieb Alexandre DERUMIER:

Maybe one last question (sorry ;)

Do you have tried to launch 2 fio test from 2 differents kvm host at the same 
time ?

If yes, do you have more io or do you have half of speed on each fio test ?

Only one VM active on a Single Xeon 3.6Ghz:
write: io=6024MB, bw=68519KB/s, iops=17129, runt= 90025msec
read : io=6057MB, bw=68891KB/s, iops=17222, runt= 90026msec
write: io=71540MB, bw=808308KB/s, iops=197, runt= 90630msec
read : io=147096MB, bw=1631MB/s, iops=407, runt= 90162msec


Only one VM active on a Dual Xeon 2.5Ghz:
write: io=2224MB, bw=25285KB/s, iops=6321, runt= 90070msec
read : io=2033MB, bw=23108KB/s, iops=5777, runt= 90078msec
write: io=50900MB, bw=574235KB/s, iops=140, runt= 90767msec
read : io=84228MB, bw=954499KB/s, iops=233, runt= 90361msec


Both VMs active (doing each test in parallel):

VM 1:
write: io=5376MB, bw=61112KB/s, iops=15277, runt= 90086msec
read : io=6092MB, bw=69292KB/s, iops=17323, runt= 90028msec
write: io=67724MB, bw=766012KB/s, iops=187, runt= 90533msec
read : io=160200MB, bw=1776MB/s, iops=444, runt= 90187msec

VM 2:
write: io=2351MB, bw=26719KB/s, iops=6679, runt= 90083msec
read : io=2190MB, bw=24899KB/s, iops=6224, runt= 90081msec
write: io=48320MB, bw=545652KB/s, iops=133, runt= 90680msec
read : io=88136MB, bw=999571KB/s, iops=244, runt= 90290msec

Right now i've no idea why the Dual Xeon is slower at all / in general.

Stefan
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