Re: [PATCH 00/18] KVM: PPC: Virtualize Gekko guests

[Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On 02/17/2010 04:56 PM, Alexander Graf wrote:
>
> So I changed to code according to your input by making all FPU calls explicit, getting rid of all binary patching.
>
> On the PowerStation again I'm running this code (simplified to the important instructions) using kvmctl:
>
>          li      r2, 0x1234
>          std     r2, 0(r1)
>          lfd     f3, 0(r1)
>          lfd     f4, 0(r1)
> do_mul:
>          fmul    f0, f3, f4
>          b       do_mul
>
>
> With the following kvm_stat output:
>
>   dec                       2236      53
>   exits                 60797802 1171403
>   ext_intr                   379       4
>   halt_wakeup                  0       0
>   inst_emu              60795247 1171344
>   ld                    60795132 1171348
>
> So I'm getting 1171403 fmul operations per second. And that's even with non-optimized instruction fetching. Not bad.
>    

It's a large number, but won't real hardware be three orders of 
magnitude faster?

-- 
error compiling committee.c: too many arguments to function