Re: [PATCH] x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue

Denys Vlasenko
2015-04-27T19:21:40Z

On 04/27/2015 09:11 PM, Borislav Petkov wrote:
> A: 709.528485252 seconds time elapsed ( +- 0.02% )
> B: 708.976557288 seconds time elapsed ( +- 0.04% )
> C: 709.312844791 seconds time elapsed ( +- 0.02% )
> D: 709.400050112 seconds time elapsed ( +- 0.01% )
> E: 708.914562508 seconds time elapsed ( +- 0.06% )
> F: 709.602255085 seconds time elapsed ( +- 0.02% )

That's about 0.2% variance. Very small.

Sounds obvious, but. Did you try running a test several times?
Maybe you are measuring random noise.