[pve-devel] switch to deadline scheduler by default
aderumier at odiso.com
Wed Mar 14 13:17:56 CET 2012
>> Many feature only work with CFQ (ionice, openvz IO priorities), so this is not an option.
Ok, din't know that.
I found an interesting article here :
recommandations for kvm and cfq for best performance are
/sys/block/device/queue/iosched/quantum = 32
/sys/block/device/queue/iosched/slice_idle = 0
Maybe can add them somewhere ?
----- Mail original -----
De: "Dietmar Maurer" <dietmar at proxmox.com>
À: "Alexandre DERUMIER" <aderumier at odiso.com>, pve-devel at pve.proxmox.com
Envoyé: Mercredi 14 Mars 2012 11:04:24
Objet: RE: [pve-devel] switch to deadline scheduler by default
Many feature only work with CFQ (ionice, openvz IO priorities), so this is not an option.
> I see some user reports about io problem with cfq scheduler
>From what I see, all those users run some very limited hardware.
> What do you think about switching to deadline scheduler by default ?
> Also deadline perform with with virtio devices (this is the default scheduler for
> rhev) For my iscsi san, it also perform better.
> just put
> in /etc/default/grub
Alexandre D erumier
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