[pve-devel] little iops with PVE kernel than vanilla 3.5

[Alexandre DERUMIER]

Maybe the iscsi module is faster on 3.5 ?
But It could be also network driver, or something else in the kernel.


I have done some test, i'm also around 15000 iops by path, 30000using 2 paths.
(i'm using gigabit links, so I can get more than 20000-22000iops by link).

Did you have tested fio directly on the host ? (with the 2 differents kernel).
I would like to see if the slowdown come from kvm or not. 

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

De: "Martin Maurer" <martin at proxmox.com> 
À: "Stefan Priebe" <s.priebe at profihost.ag> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Dimanche 22 Juillet 2012 09:47:12 
Objet: Re: [pve-devel] little iops with PVE kernel than vanilla 3.5 

> -----Original Message----- 
> From: Stefan Priebe [mailto:s.priebe at profihost.ag] 
> Sent: Samstag, 21. Juli 2012 22:39 
> To: Martin Maurer 
> Cc: pve-devel at pve.proxmox.com 
> Subject: Re: [pve-devel] little iops with PVE kernel than vanilla 3.5 
> 
> Am 21.07.2012 22:05, schrieb Martin Maurer: 
> >> -----Original Message----- 
> >> From: pve-devel-bounces at pve.proxmox.com [mailto:pve-devel- 
> >> bounces at pve.proxmox.com] On Behalf Of Stefan Priebe 
> >> Sent: Samstag, 21. Juli 2012 21:24 
> >> To: pve-devel at pve.proxmox.com 
> >> Subject: [pve-devel] little iops with PVE kernel than vanilla 3.5 
> >> 
> >> Hello list, 
> >> 
> >> i'm still trying to tune my Proxmox environment. 
> >> 
> >> On my KVM Host i get constant 100.000 4k random iops with vanilla 3.5 
> >> and latest PVE kernel - so no difference. 
> >> 
> >> But inside VM using LVM block device with virt io: 
> >> 
> >> PVE Kernel: 
> >> 1 VM: 15k iops 
> >> 2 VM: 2x10k iops 
> >> 
> >> 3.5 vanilla Kernel: 
> >> 1 VM: 60k iops 
> >> 2 VM: 2x30k iops 
> >> 
> >> Anything we can do about that? 
> > 
> > Give all details (Hardware, Software, used benchmark command) and I will 
> try to reproduce it in the lab. 
> 
> thanks 
> 
> Storagesystem: 
> Raid 0 of 16 Intel 520 series SSD 
> exported via LIO iSCSI 
> 10GBE Network 
> Debian Squeeze 
> Kernel 3.5-rc7 
> Single Xeon E5 1620 
> 
> Proxmoxsystem: 
> Proxmox 2.1 from iso with latest git packages open-iscsi 2.0-873 with 4 sessions 
> and multipath Dual Xeon E5-2640 LVM on top of iscsi block device 
> 
> disks set to noop scheduler. 
> 
> Benchmark command: 
> fio --filename=$DISK --direct=1 --rw=randwrite --bs=4k --size=200G 
> --numjobs=50 --runtime=90 --group_reporting --name=file1 
> 
> Anything else you need? 

Yes, I would like to have such a hardware (storagesystem and 10gbit network) in our test lab. Currently our test lab can´t compete with yours. 
Martin 

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Alexandre D e rumier 

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