Re: 64 bit guest much faster ?

Avi Kivity
2009-10-26T10:44:36Z

On 10/26/2009 12:42 PM, Michael Tokarev wrote:
>> Oh yes, without ept/npt the slowdown should indeed be significant
>> with this much memory.
>
>
> How it is with 4Gb guest/mem without PAE (I mean, with
> CONFIG_HIGHMEM_4G=y)?
> Or even 2Gb? In case of npt or without.
>

It'll be slow. Just use x86_64 with > 1GB.

> Can we construct a sort of a table of expected slowdowns (not in numbers
> but just in terms "significant", "minor" etc) of running <4Gb or >4Gb
> (and <1Gb and >1Gb if that makes significant diffencece) 32bit guests
> with and without npt and 64bit guests, please? I guess it's quite
> interesting to many users.

These tables will be useless, it greatly depends on workload.

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