[libre-riscv-dev] [Bug 376] Assess 40/45 nm 2022 target and interfaces

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=376

Jacob Lifshay <programmerjake at gmail.com> changed:

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                 CC|                            |programmerjake at gmail.com

--- Comment #7 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #3)
> i am inclined to seriously recommend at least two separate OMI interfaces
> (with the option to use them in parallel), one to be connected to a video
> DRAM chip, the other to be connected to a "OS / GPU" memory DRAM chip,
> with the option to say "i don't care about that, just use one or both for
> general shared memory"

I strongly disagree with the idea of partitioning memory interfaces between GPU
and CPU tasks, since the processors are designed to do both kinds of tasks well
and splitting the memory interfaces up is basically saying: "all the CPU tasks
can't use as much memory bandwidth as GPU tasks just because we say so". Also,
I envision people building new varieties of tasks that are a hybrid between CPU
and GPU tasks, so it will be harder to differentiate them because of things
that fall in the grey areas.

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