Adrian (a.delete@this.acm.org) on December 3, 2021 8:52 am wrote:
> Adrian (a.delete@this.acm.org) on December 3, 2021 8:47 am wrote:
> > Anon (no.delete@this.thanks.com) on December 3, 2021 6:52 am wrote:
> > > Kara (karaardalan.delete@this.gmail.com) on December 3, 2021 6:36 am wrote:
> > > > none (none.delete@this.none.com) on December 3, 2021 6:19 am wrote:
> > > > > Kara (karaardalan.delete@this.gmail.com) on December 3, 2021 6:05 am wrote:
> > > > > > Adrian (a.delete@this.acm.org) on December 3, 2021 5:51 am wrote:
> > > > > > >
> > > > > > > https://www.nextplatform.com/2021/12/02/aws-goes-wide-and-deep-with-graviton3-server-chip/
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > The N2 is described much wider here than Arm has ever disclosed.
> > > > > > I hate it when companies do this, like give some info what's gonna happen?
> > > > >
> > > > > What description of N2 is there in that article? I only see guesses.
> > > >
> > > > I meant the guesses, it's so not ARM to design 8 wide decode and 15 wide issue
> > > > mArchs. 64kb l1i cache wouldn't be able to keep up Nor the punly ROBs, how
> > > > do you feed such a wide core? Without smt or legendry l1i and rob?
> > > >
> > > > Neoverses are targeted toward server processors, making them wider doesn't make any sense.
> > >
> > > I thought that this was the V1 core? Aimed at maximum perf per thread.
> >
> >
> > Amazon did not disclose which core they have used, but what was said matches better N2 than V1.
> >
> > Choosing N2 also makes more sense for Amazon, because they are more interested in
> > general-purpose performance within a given power consumption than on performance
> > when only few threads are active or performance for floating-point applications.
> >
> >
> >
> >
> >
> >
> >
>
>
> Moreover, Graviton 3 uses 100 W for 64 cores.
>
> After subtracting uncore power, the power limit per core will be 1.25 W at most.
>
> This power level is below what a core from the X1/X2/V1 series requires, which is in the 2 ... 3 W range.
>
>
> Power levels in the range 1 ... 1.5 W per core are the target for N1/N2.
>
> This is an additional reason to believe that Graviton 3 uses N2.
>
>
>
>
>
>

I think Graviton3 uarch matches exactly with cortex-V1.

https://i2.wp.com/semianalysis.com/wp-content/uploads/2021/12/7.jpg?w=2048&ssl=1
https://images.anandtech.com/doci/16640/Neoverse_V1_13_575px.png