[pve-devel] [PATCH] rbdplugin : disable debug_ms to increase performance

[Alexandre DERUMIER]

>>apart from debug_ms = 0/0, what are the currently suggested defaults for these performance tweaks?

you can also disable other debug values in ceph.conf, but I don't see super big improvments

Another quick wins:

- disable cephx authentification
- rbd_cache=false (cache=none), improve read latency too.
(but if you do sequential writes, you'll loose block merging, so big difference. You need to see what is best for your application here)

- use big frequency cpu (both client and server)



some big improvement should come soon in librbd
http://tracker.ceph.com/issues/13025

(a patch for qemu has been send this week too).

This will allow to use iov,  avoid copying through a buffer data from qemu block layer to librbd. So this should improve latency).



----- Mail original -----
De: "Waschbüsch IT-Services GmbH" <service at waschbuesch.it>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Dimanche 6 Novembre 2016 23:15:39
Objet: Re: [pve-devel] [PATCH] rbdplugin : disable debug_ms to increase performance

> Am 05.11.2016 um 15:43 schrieb Alexandre Derumier <aderumier at odiso.com>: 
> 
> This increase iops and decrease latencies by around 30% 

Alexandre, 

apart from debug_ms = 0/0, what are the currently suggested defaults for these performance tweaks? 
_______________________________________________ 
pve-devel mailing list 
pve-devel at pve.proxmox.com 
http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel