On 15.06.2011, at 12:50, Alexander Graf wrote:
>
> On 15.06.2011, at 01:34, Scott Wood wrote:
>
>> This is a shared page used for paravirtualization. It is always present
>> in the guest kernel's effective address space at the address indicated
>> by the hypercall that enables it.
>>
>> The physical address specified by the hypercall is not used, as
>> e500 does not have real mode.
>
> What are your results when using the magic page? I have the following numbers
> with your patches applied:
>
> == bare metal ==
>
> root@e500:~/kvm# time for i in {1..1000}; do /bin/echo > /dev/null; done
>
> real 0m5.445s
> user 0m0.204s
> sys 0m0.572s
>
>
> == no hypervisor node (magic page not used) ==
>
> debian-powerpc:~# time for i in {1..1000}; do /bin/echo > /dev/null; done
>
> real 1m36.362s
> user 0m13.224s
> sys 1m11.084s
>
>
> == with hypervisor node (magic page used) ==
>
> debian-powerpc:~# time for i in {1..1000}; do /bin/echo > /dev/null; done
>
> real 2m28.888s
> user 0m9.248s
> sys 1m4.016s
Interesting - now I'm down to:
debian-powerpc:~# time for i in {1..1000}; do /bin/echo > /dev/null; done
real 1m25.008s
user 0m9.224s
sys 1m5.720s
Oh well, let's hope I did something wrong before :).
Alex
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