Re: [Qemu-devel] Re: qemu-kvm faster than qemu?

[Avi Kivity]

 On 08/27/2010 12:57 AM, walt wrote:
> > Also try qemu-kvm with -no-kvm-irqchip. I can't believe an in-kernel 
> > lapic would make this much of a difference with windows 7 but it's 
> > worth trying.
>
> Using that flag wipes out the difference entirely:  both come in at 
> about 65 seconds.
>
> I also tried xp-32 running on the same two kvm64 virtual machines, 
> with slightly
> different results:
>
> qemu-kvm:  35 seconds (65 seconds using -no-kvm-irqchip, a huge 
> disadvantage)
> qemu:      58 seconds
>
> Anything unexpected in these results?

Looks like kernel irqchip is the cause for the difference, which isn't 
too surprising.


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