VMware performance decrease after Retbleed update

Solution Verified - Updated -


  • VMware performance decrease after upgrade to RHEL 8.6
  • High CPU usage by ksoftirqd after upgrade to RHEL 8.7
  • Retbleed mitigations cause heavy CPU usage impact
  • CPU utilization is high after patching


  • Red Hat Enterprise Linux 8.6 (kernel-4.18.0-372.32.1.el8_6 and later)
  • Red Hat Enterprise Linux 7.9 (kernel-3.10.0-1160.80.1.el7 and later)
  • Red Hat Enterprise Linux 9.1 (kernel-5.14.0-162.6.1.el9_1 and later)
  • VMware VM
  • CPU NOT affected by Retbleed vulnerability:

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