Re: [kvm-devel] performance with guests running 2.4 kernels (specifically RHEL3)

Avi Kivity
2008-05-19T17:04:51Z

David S. Ahern wrote:
> Does the fact that the hugemem kernel works just fine have any bearing
> on your options? Or rather, is there something unique about the way
> kscand works in the hugemem kernel that its performance is ok?
>
>

Yes. If your guest has < 4GB of memory, then all of it is lowmem in the
hugemem kernel, and the two-step process for modifying a pte is
short-circuited into just one step, and everything works fine.

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