QEMU IOPS Burst

[Ashley]

Hello,

I'm fully aware how the burst IOPS work within QEMU being a leaky bucket setup, however all the reading I have done on QEMU and IOPS Burst value is their should also be set a value of how many seconds you wish this to be.

For example if set to 10 Seconds then the bucket size is IOPS Burst Value * 10, currently there is no GUI option for this, and googling I have been unable to find anything specific to Proxmox, just how to set in a normal QEMU environment (e.g https://blogs.igalia.com/berto/2016/05/24/io-bursts-with-qemu-2-6/)

So within a Proxmox environment, if for example IOPS is set to 500 as standard and then 1000 burst, what is the default value used to control the size / length of the burst tank, and what is this set to by default.

Thanks,

 

[spirit]

lenght has been added in qemu 2.6. But proxmox don't expose the configuration yet. (I think we should add it)

from the qemu patch, the default value seem to be "1"

https://patchwork.kernel.org/patch/8233571/

 

[Ashley]

Thanks, just the information was looking for, and yes would be a nice and Guess fairly easy change to add to the GUI. But knowing the default value has atleast allowed me to better decide the burst value per use case.

Thanks

 

[spirit]

can you make a feature request on proxmox bugzilla ?

http://bugzilla.proxmox.com

I'll try to add it next week, it's pretty fast to implement

 

[Ashley]

Done : https://bugzilla.proxmox.com/show_bug.cgi?id=1195

Thanks