Discussion ARM Cortex/Neoverse IP + SoCs (no custom cores) Discussion

[Doug S]

you could have chosen any other ARM platform to make your point cause Apple silicon has TSO.

Doesn't Qualcomm also support it? I thought ARM had even defined this mode as an optional extension, so if the memory model is the issue it wouldn't be with the next generation of Nvidia Grace cores, assuming ARM implements that option in newer Neoverse cores.

 

[poke01]

Doesn't Qualcomm also support it?

my bad, they do support TSO and can switch between TSO and WO. As far I know there are only 2 ARM CPU platforms, funnily enough both foundations were created by Gerard W III.

next generation of Nvidia Grace cores, assuming ARM implements that option in newer Neoverse cores.

Nvidia by default used TSO in its ARM Carmel CPUs and its always on. Don't know why they haven't switched over to what Qualcomm and Apple do for their upcoming cpu

https://threedots.ovh/blog/2021/02/cpus-with-sequential-consistency/

 

[soresu]

yeah server Tegras are garbage.
NV spent like 2 years running around peddling Grace-Grace to like, everyone and it's lol.

Bad because the ARM Neoverse component IP are fundamentally bad?

Or because nVidia SoC integration staff aren't up to it?

 

[adroc_thurston]

Bad because the ARM Neoverse component IP are fundamentally bad?

No, Graviton is dang good.

Or because nVidia SoC integration staff aren't up to it?

Yeah they suck and their fabrics suck even more.
That mesh is a crime against humanity.

 

[LightningDust]

Doesn't Qualcomm also support it? I thought ARM had even defined this mode as an optional extension, so if the memory model is the issue it wouldn't be with the next generation of Nvidia Grace cores, assuming ARM implements that option in newer Neoverse cores.

I'm not sure what you mean by this - Nvidia NVX (aka Olympus) isn't Neoverse.

 

[poke01]

I'm not sure what you mean by this - Nvidia NVX (aka Olympus) isn't Neoverse.

Yeah it’s custom and a custom cpu core from Nvidia is a “will it be a good or bad situation”

 

[soresu]

Yeah it’s custom and a custom cpu core from Nvidia is a “will it be a good or bad situation”

If adroc is correct then no amount of custom core kung fu will put them on Apple's level, because their SoC game is in the toilet.

 

[adroc_thurston]

because their SoC game is in the toilet.

Understatement of the decade.
Tegra Thor has like 200ns mem latency.