[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.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
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