[pve-devel] pve-manager and disk IO monitoring

[Alexandre DERUMIER]

>>So, what was your test environment? How big was the difference?

That's strange, they are technical difference between virtio-scsi && virtio-scsi-single.

with virtio-scsi-single you have 1 virtio-scsi controller by disk.


for iothread, you should see difference with multiple disk in 1 vm.
This need virtio-scsi-single, because the iothread is  mapped on controller, not the disk.



----- Mail original -----
De: "Andreas Steinel" <a.steinel at gmail.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Vendredi 14 Octobre 2016 11:13:34
Objet: Re: [pve-devel] pve-manager and disk IO monitoring

Hi Mir, 

On Fri, Oct 14, 2016 at 8:02 AM, Michael Rasmussen <mir at datanom.net> wrote: 
> I use virio-scsi-single exclusively because of the hough performance 
> gain in comparison to virtio-scsi so I can concur to that. 

I just benchmarked it in on a full-SSD-ZFS system of mine and got reverse 
results. 
I used 4 cores, 512 MB-RAM (fio 2.1.11, qd32, direct, libaio) and this 
varies: 

Test | sequential 8K | randread 4K | randrw 4K 50/50 
----------------------+---------------+-------------+---------------- 
virtio-scsi | 53k | 57k | 11k 
virtio-scsi-single | 35k | 41k | 11k 
virtio-scsi IO/Thread | 29k | 43k | 11k 
virtio-scsi-single IO | 29k | 44k | 11k 


So, what was your test environment? How big was the difference? 

Best, 
LnxBil 
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