[Bloat] known buffer sizes on switches

[Bruno George Moraes]

>
> Nice resource, thanks.
>
> If someone wonders why things look the way they do, so it's all about
> on-die and off-die memory. Either you use off-die or on-die memory, often
> SRAM which requires 6 gates per bit. So spending half a billion gates
> gives you ~10MB buffer on-die. If you're doing off-die memory (DRAM or
> similar) then you'll get the gigabytes of memory seen in some equipment.
> There basically is nothing in between. As soon as you go off-die you might
> as well put at least 2-6 GB in there.
>
>
There are some reasearch on new memory devices with unexpected results...
https://ieeexplore.ieee.org/document/8533260

The HMC memory allows improvements in execution time and consumed energy.
> In some situations, this memory type permits removing the L2 cache from the
> memory hierarchy.
>

HMC parts start at 2GB
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