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It's interesting to see AMD's take on big-little. The only difference between their Zen 4 core (big) and Zen 4c (little) cores is the speed and thermal charact
by ta8645 3y ago
It's interesting to see AMD's take on big-little. The only difference between their Zen 4 core (big) and Zen 4c (little) cores is the speed and thermal characteristics. Owing to the same architecture (RTL) being implemented by both, with only the layout and cell density differing.
https://youtu.be/h80TB8K-Rfo?t=260 https://youtu.be/h80TB8K-Rfo?t=260
- pohl 3y agoIs that meaningfully different from Apple’s take?
- MBCook 3y agoI don’t think so. But it is different from some Intel CPUs where the efficiency cores didn’t support all the vector ops the performance cores did, causing issues with some software.
- kfreds 3y agoGreat video! Thanks for the link. By the way, I was confused by how you equated architecture and RTL. In this context I use "architecture" to mean ISA. I use "microarchitecture" to refer to how e.g. its performance characteristics are realized, like IPC. You seem to know more than I do and would love you to comment. Thanks!
- Aardwolf 3y agoI like this approach (especially because it supports AVX-512), however even not counting the Zen 4c, AMD 3D v-cache CPU's have cores that are sufficiently heterogeneous (those with and without 3D cache) that some special scheduling is desired for some use cases (gaming on Windows)