[pve-devel] default I/O scheduler - CFQ or Deadline?

[Martin Maurer]

Hi all,

We want to discuss the changing of the pve default I/O scheduler from CFQ to Deadline. I want to collect feedback, pros and cons here.

CFQ:
- only CFQ support priorities (ionice)

Deadline:
- No support for priorities but generally faster for KVM in some (or a lot of?) systems.

The scheduler can always be changed manually if the default is not suited (e.g. in /etc/default/grub).

What do you think about this? Please report your thoughts!

Martin