juanrga (nospam.delete@this.juanrga.com) on August 16, 2014 4:39 am wrote:
> Klimax (danklima.delete@this.gmail.com) on August 16, 2014 3:56 am wrote:
> > juanrga (nospam.delete@this.juanrga.com) on August 16, 2014 3:15 am wrote:
> > > Maynard Handley (name99.delete@this.name99.org) on August 15, 2014 4:41 pm wrote:
> > > > David Kanter (dkanter.delete@this.realworldtech.com) on August 15, 2014 3:01 pm wrote:
> > > > > juanrga (nospam.delete@this.juanrga.com) on August 15, 2014 11:39 am wrote:
> > > > > > David Kanter (dkanter.delete@this.realworldtech.com) on August 15, 2014 9:41 am wrote:
> > > > > >
> > > > > > > I also am skeptical that anyone can match Intel in performance while trailing behind by a node. To do that,
> > > > > > > it is necessary to offer a very different product with a
> > > > > > > different system architecture. E.g., target workloads
> > > > > > > where cache does not help and simply slap down more memory controllers and cores (hint: that's a GPU!).
> > > > >
> > > > > > The ISA advantage will be greatly reduced in the top-end
> > > > > > side of the performance spectrum, but will not vanish.
> > > > > > Keller mentioned during Core Day conference that his K12
> > > > > > core will have a "bigger engine" than its x86 sister
> > > > > > thanks to the advantages of ARMv8 over x86-64, which allows to spend more transistors on compute.
> > > > >
> > > > > I happen to know the differences between those two designs. I'm not really sure it's
> > > > > going to translate into a significant performance delta. My guess is maybe 10%.
> > > >
> > > > 10% is two years of Intel's current 5% improvement a year.
> > >
> > > And what if final number is more close to 20--30%?
> > Terminally unproven and terminally without any evidence. Just
> > supposition on side of ARM proponents. Nothing more.
> >
>
> It was a mere question not a bold statement in need of silicon benchmarks. But
> I agree you have not proven anything still except your dislike by ARM servers.

Problem is, there is not even evidence there could be found 20%.(As a theoretical possibility) Much less that even 10% are there. (One should definitely keep on mind, that ancient depreciated x86 instructions got moved into microcode and that most sane compilers will avoid most problematic instructions. Which will definitely skew instruction mix in real workload and may miss most of x86 problems, because of used versions of instructions)

As for me, I definitely don't like slideware/vaporware. Also people who go on and on how great slideware will be when it will finally get released.