Red Hat Bugzilla – Bug 1343960
empty ioTune policy is being set periodically even when no QoS is configured at all
Last modified: 2016-08-23 17:09:47 EDT
+++ This bug was initially created as a clone of Bug #1337228 +++ Currently mom issues several calls on per VM basis every 15s. Some of them are not needed, notably setting the iotune policy when nothing is configured in the engine (that's the default) This has impact on performance in scale environment --- Additional comment from Roy Golan on 2016-05-19 10:01:06 CEST --- (In reply to Michal Skrivanek from comment #0) > Currently mom issues several calls on per VM basis every 15s. Some of them > are not needed, notably setting the iotune policy when nothing is configured > in the engine (that's the default) > This has impact on performance in scale environment What's the impact if? you mean calling VDSM I guess and not an empty IOtune which sets something? --- Additional comment from Doron Fediuck on 2016-05-30 11:23:55 CEST --- Is this relevant for 4.0 as well? --- Additional comment from Michal Skrivanek on 2016-05-30 11:27:16 CEST --- Roy, can you please rephrase the question? Impact is a heavy API call every few ms on a busy host. Doron, yes.
verified on : Red Hat Enterprise Virtualization Manager Version: 4.0.0.6-0.1.el7ev mom-0.5.4-1.el7ev.noarch vdsm-4.18.4-2.el7ev.x86_64 verification steps: 1. run some VMs with guest agent 2. check in vdsm logs that logs with the words :vmSetIoTune and vmGetIoTune won't appere
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-1696.html