https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225579
Bug ID: 225579
Summary: CPU usage in top command not matching with VMWare
Host's esxtop command's vCPU output
Product: Base System
Version: 11.0-STABLE
Hardware: arm64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 190217
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=190217&action=edit
Schreenshot of top and esxtop with FreeBSD VM 10.3
Hello Experts,
VM: FreeBSD 11.0 Stable [Seen with FreeBSD 10.3 stable and lower version as
well]
Hypervisor : ESX 6.0 (ESXi-6.0.0-20171104001-standard (Build 6921384))
5 vCPUs are allocated for the VM, 10 GB RAM and 20 GB disk. vCPU pinning is
done for the VM.
Test Case: A shell script with the following commands:
dd if=</a_2gb_file> of=<an output file> &
dd if=</a_2gb_file> of=<an output file> &
dd if=</a_2gb_file> of=<an output file> &
dd if=</a_2gb_file> of=<an output file> &
dd if=</a_2gb_file> of=<an output file> &
The top command output and esxtop command output is attached for FreeBSD VM:
Freebsd_VM.jpg
If we compare the vCPU IDLE times, there is a difference of around 60%.
We would like understand why it is happening and fix it as needed.
Few additional notes:
- This issue is seen with XenServer 7.1. So issue is hypervisor agnostic.
- Another data point, we do not observe similar issue with a Ubuntu VM on the
same ESX hypervisor.
Let us know.
Regards,
Nirmal
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