Poor Performance VM Images

[Blake.v]

I wanted to move from ESXi to a KVM type setup, and sins Proxmox 5 was just released I decided to give it a try. My main windows VM is being treated as a desktop, if I can manage 90% bare metal performance then I'll be more then happy. Right now I em also running a small container with a basic Samba setup.

My main issue right now is huge lag (up 10% IO delay on the webgui and serouse usability problems in Windows) if I'm transferring anything to or from the zfs image as my D: drive.
I had the same issue with my C: drive, switching from qcow2 to raw fixed that.

But I can transfer to the network share (that's on the same zfs pool) without issue. In both cases it averages over 200MBs

I'm currently using an older AMD setup:
FX-8150
32GB ddr3
4x2tb drives in raidz1
64gb SSD for Proxmox
240GB SSD my daily Windows VM

balloon: 0
bootdisk: virtio0
cores: 6
cpu: host
hostpci0: 01:00,pcie=1,x-vga=on
hostpci1: 02:00.0,pcie=1      #2-Port SATA
hostpci2: 08:05                     #PCI sound card
hostpci3: 04:00.0,pcie=1      #3*2port USB3 Controllers
hostpci4: 05:00.0,pcie=1
hostpci5: 06:00.0,pcie=1
machine: q35
memory: 12288
name: Blake-Win10
net0: virtio=4E:4B:FC:DF:84:56,bridge=vmbr0
numa: 0
ostype: win10
scsihw: virtio-scsi-pci
smbios1: uuid=ff559531-a1ff-49cc-921a-582c4bc72dfe
sockets: 1
virtio0: SSD:100/vm-100-disk-1.raw,size=200G
virtio1: ZFS:vm-100-disk-1,size=1T

I also have a small issue with usb, so I'll likely be asking help with that later, but one problem at a time.

Thanks.

 

[FastLaneJB]

Have you tried cache settings for instance? Try changing the ZFS disk to cache=writeback to see how that affects performance and IO delay.

 

[Blake.v]

It seamed to make a small difference, but didn't solve the issue.
Still rather excessive cpu usage, and io delay.

 

[udo]

It seamed to make a small difference, but didn't solve the issue.
Still rather excessive cpu usage, and io delay.

Hi,
my zfs-experiences with an FX8350 are also not so good. High IO-Delay and not so much performance.
Looks, that you have an better performance with intel-cpus (or the new amd?).
In my case I switched to hardwareraid (areca) and the performance was quite good.

Udo