[pve-devel] less cores more iops / speed

[Alexandre DERUMIER]

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.priebe at profihost.ag> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at 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