How anti-virus on the host machne affects performance of virtual machines?

Posted by Ladislav Mrnka on Super User See other posts from Super User or by Ladislav Mrnka
Published on 2011-07-01T08:14:31Z Indexed on 2011/07/01 8:24 UTC
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I'm diagnosing some issue with Oracle virtual box where virtual machine sometimes perform terribly slow (much slower then notebook with worse configuration):

Notebook

  • i7 (2 cores with HT = 4 logical CPUs), 4GB RAM, 5400 rpm disk, Win 7 64bit

Virtual machine (Oracle Virtual Box)

  • Host: i7 (4 cores with HT = 8 logical CPUs, 12 GB RAM, system runs from SSD, virtual machine from 7200 rpm disk, Win 7 64bit)
  • Virtual machine: 4 cores assigned, 8 GB RAM assigned, Win 2008 R2 Enterprise (64 bit)
  • Virtual machine uses bridge to separate network interface (machine has two)
  • VPN for network communication
  • No other virtual machine runs on the host
  • Host has installed ESET Smart Security

All SW is updated with last version.

My question is if anti-virus on the host machine can somehow affect performance of the virtual machine and if so how can I turn it off without turning the anti-virus itself?

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