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

[Stefan Priebe]

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?

thanks,
Stefan