[PATCH v2 3/3] powerpc:selftest update memcmp_64 selftest for VMX implementation

[Simon Guo]

Hi David,
On Mon, Sep 25, 2017 at 09:30:28AM +0000, David Laight wrote:
> From: wei.guo.simon at gmail.com
> > Sent: 21 September 2017 00:35
> > This patch adjust selftest memcmp_64 so that memcmp selftest can be
> > compiled successfully.
> ...
> >  #define ITERATIONS 10000
> > 
> > +#define LARGE_SIZE (5 * 1024)
> > +#define LARGE_ITERATIONS 1000
> ...
> 
> Measuring performance by doing a lot of iterations isn't ideal
> and is pretty pointless.
> Cold cache performance can be more useful.
> Also you don't really want any dynamic branch prediction logic
> tuned to the exact test you keep doing.

I think the (orignal) selftest aims at full coverage of functionality
correctness, since each iteration generates a new data set by random.

Thanks,
- Simon