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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Filed under:

Windows

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virtualbox

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Performance

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anti-virus

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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