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

Alexandre DERUMIER aderumier at odiso.com
Mon May 6 14:56:47 CEST 2013


If I remember, some openvz features works only with cfq ? (ionice, openvz IO priorities)
see:
http://pve.proxmox.com/pipermail/pve-devel/2012-March/002488.html


Myself, I'm using deadline (because It's works better for my workload with my san), but I use kvm guests.

----- Mail original ----- 

De: "Martin Maurer" <martin at proxmox.com> 
À: pve-devel at pve.proxmox.com 
Envoyé: Lundi 6 Mai 2013 14:21:54 
Objet: [pve-devel] default I/O scheduler - CFQ or Deadline? 

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 





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