[SOLVED] Solutions for Consistently High CPU Usage

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mrnim94

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Proxmox Subscriber
Oct 30, 2019
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Hi team Proxmox,
I have physical Server with 16-core/32-thread . I create 4 VMs and per VM provided 32 vCPU.

case 1: When only VM running and using 100% vCPU, how physical server use the CPU?

case 2: if all VMs running and using 100% vCPU, how physical server use the CPU?

Do proxmox have overcommit CPU ?

Thanks all.
 
Hi,

the recommended max VCPU per Guest is N(is Host core count) -1.
If you use all you produce unnecessary interrupts what is, in the end, slower than -1 core.
To both of your cases: The interrupt increase what slows you system down.

mrnim94 said:
Do proxmox have overcommit CPU ?
Click to expand...
Yes
 
Interesting question..

How many vCPU slots can we power on simultaneous for VM guest in terms of overcommit?
 
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