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If you see output similar to the following example from Oracle Linux, this shows services that implicitly enable CPU accounting:

/usr/lib/systemd/system/unified-monitoring-agent_config_downloader.service:CPUQuota=40%
/usr/lib/systemd/system/unified-monitoring-agent.service:CPUQuota=40%

Solution

The cause of the problem is that CPU accounting is enabled on the Linux host system.

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• If possible disable or remove the software that enables CPU accounting and reboot Linux before starting the emulator again.
• If you cannot remove or disable the offending software, you can enable the following workarounds:
  • Remove the limitation on real-time scheduling:
    # sysctl -w kernel.sched_rt_runtime_us=-1 (add to sysctl.conf to make permanent).
    This introduces the risk that a run-away real-time process could starve other processes and in extreme cases, lock up the system. The default value of this parameter is 950000 (=0.95 seconds).
  • Disable CPU accounting at boot by adding the following parameter to the kernel boot line:
    cgroup_disable=cpu
    Test this during an interactive boot first. If satisfied with the result, make it permanent. For example, by using:
    # grubby --update-kernel=ALL --args="cgroup_disable=cpu".
    Please note: this setting may prevent some software packages from running that are dependent on CPU accounting.

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