VDSM encounters high cpu usage on RHEV-H 6.5 on an idle system

Solution Unverified - Updated -

Issue

  • After upgrading RHEV-H from 6.4 to 6.5, vdsm is now using a lot of cpu time and the system-wide cpu usage is around 60% on an idle system with no active VMs.

  • Sample vdsm cpu usage extracted from running top against the main vdsm process;

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND   
24788 vdsm       0 -20 7185m  98m  10m S 2127.3  0.0  63210:30 vdsm             
24788 vdsm       0 -20 7185m  98m  10m S 1843.1  0.0  63211:27 vdsm             
24788 vdsm       0 -20 7185m  98m  10m S 1858.5  0.0  63212:23 vdsm             
24788 vdsm       0 -20 7185m  98m  10m S 1862.4  0.0  63213:21 vdsm
  • Sample cpu usage from sar;
02:40:01 PM     all      2.99      0.00     77.44      0.06      0.00     19.50
02:50:01 PM     all      3.01      0.00     77.10      0.06      0.00     19.83
03:00:01 PM     all      3.04      0.00     77.42      0.07      0.00     19.47
03:10:01 PM     all      3.05      0.00     78.13      0.07      0.00     18.75

Environment

  • Red Hat Enterprise Virtualization Hypervisor (RHEV-H) 6.5 20140217.0
  • vdsm-4.13.2-0.x
  • In two discrete storage environments;
    • one with 40 FibreChannel storage domains
    • one with 30 iSCSI storage domains

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