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Can ACS Override reduce performance?

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in VM Engine (KVM)

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I was just reading another thread and someone suggested turning off ACS Override for systems that have certain intel CPU that "don't need it" to increase VM performance.

 

I'm currently having a difficulties getting server 2012 r2 working at a reasonable speed and I do have ACS Override enabled so that I could pass through 2 NIC's for my pfSense VM.

 

Can anyone explain why ACS Override can reduce performance?

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    Should not affect cpu/vm performance. It's strictly defining how PCI devices are managed by host. Essentially lying to the kernel telling it everything is fine, all separated, nothing to see here.

     

    https://lkml.org/lkml/2013/5/30/513

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