[pve-devel] qemu 4.4 : rbd : snapshot memory, savevm is hanging

Alexandre DERUMIER aderumier at odiso.com
Mon Nov 9 12:06:01 CET 2015

some news,

it seem to be a ceph regression is last hammer,


        rbd_non_blocking_aio = false

(which revert to old behaviour)

fix the problem for me, when cache=none (or rbd_cache=false) is used

I have sent a mail to ceph mailing to debug that.

----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "aderumier" <aderumier at odiso.com>, "Wolfgang Bumiller" <w.bumiller at proxmox.com>, "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Lundi 9 Novembre 2015 06:14:52
Objet: Re: [pve-devel] qemu 4.4 : rbd : snapshot memory, savevm is hanging

@wolfgang: do you still have those patches to use a dedicated thread for savevm? 

> mmm,it's not so easy, classic migration and colo use a dedicated thread 
> ( rcu_register_thread()), that's why they can use more granular 
> mutex_iothread_locks. 

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