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I am running Centos 7 in Virtualbox 4.3.14. The VM is configured with

  • 2 CPUs
  • 4 GB RAM
  • 3.10.0-123.4.4.el7.x86_64 kernel

The host machine is running

  • Windows 7 Pro SP1 64-bit
  • Intel i7-4790 CPU, Hyper-Threading enabled
  • 16 GB RAM

Yet, when I start up this VM, it bring my entire system almost to a halt, including my host OS. In Process Explorer of System Internal, I can see all my cores are maxed out by VirtualBox. On my VM using top, the load average is about 2 when the system "idles".

Previously I used to run a similar configuration using only a laptop with 6 GB of RAM without any problems.

What else can I try to make this VM usable?

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migrated from serverfault.com Aug 5 '14 at 14:47

This question came from our site for system and network administrators.

  • Could you show what you see when you run top on your guest? – Marcelo Aug 5 '14 at 14:52
  • I cannot. I need more "rep".On the i7 server get a load average of 15.37 (top processes are java processes that take 12.5% - 40.6% each). I copied the same VM to an i5 laptop with only 8 GB RAM and got a load average of 2.28 (top processes are the same java processes that take 17.3% - 17.6% each). – Jasper Citi Aug 5 '14 at 15:57
  • en.wikipedia.org/wiki/Load_average#Unix-style_load_calculation – a CVn Aug 6 '14 at 7:52
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Turns out the physical host machine's CPU fan was never plugged in and because the CPU was overheating, the system slowed down to protect itself.

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