CAP and performance problem

[Massimo Canonico <mex@di.unipmn.it>]

Hi,
I sent the following problem on xen-user ML without an answer. I hope 
I'll get one in this ML.

My application is written in std C++ and it makes a matrix 
multiplication: so it uses only CPU and memory (no I/O, no network).

I'm quite surprise that with CAP = 100% I got my results in about 600 
seconds and with CAP = 50% I got my results in about 1800 seconds 
(around 3 times longer).

For this kind of application I was expecting to get results in about 
1200 seconds (2 times longer) for the second scenario with respect to 
the first one.

Of course, the HW and SW are exactly the same for the 2 experiments.

Am I wrong or the CAP mechanism is not working well?

Thanks,
  Massimo