Different CPU usage in pfSense and vSphere
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I have an issue that vSphere client and pfSense report different CPU utilization (see attached screenshots). This problem was discussed some time ago (https://forum.pfsense.org/index.php?topic=83428.0, https://forum.pfsense.org/index.php?topic=70092.0) but I could not find an actual explanation there. Those threads are quite old, so I decided to start a new one. The test case was a downloading on full speed with OpenVPN client enabled. vSphere client shows 100% CPU load and almost 7GHz used. pfSense shows 51% CPU load and the current CPU clock of 412 MHz. How can this be explained?
ESXi host:
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ESXi-6.0.0-20150902001-standard
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SuperMicro X10SLM+-LN4F
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Intel Xeon E3-1230v3
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16GB of DDR3 ECC Reg RAM
pfSense VM:
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pfSense 2.2.6-RELEASE (amd64)
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2 vCore
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1GB of RAM
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2 physical NICs (Intel i210AT) passed-through to VM
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Open-VM tools installed
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i guess it is because the virtualmachine can't know the overhead the hypervisor gets.
this is true in every OS you run in a virtual machine. the type of OS will generate different amounts of overhead, depending on task its doing.
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i guess it is because the virtualmachine can't know the overhead the hypervisor gets.
this is true in every OS you run in a virtual machine. the type of OS will generate different amounts of overhead, depending on task its doing.
First of all, thanks for your reply, what you're saying makes sense. I thought that passing-through NICs would minimize the overhead, but if you're right - then I have 50% of overhead. This doesn't sound right to me, but I'm not an expert :) Do you have any ideas why pfSense shows that the current frequency is 412 MHz?