Some 'reverse-engineering' of Zen

By: juanrga (nospam.delete@this.juanrga.com), October 3, 2015 3:48 am
Room: Moderated Discussions
It seems some 'reverse-engineering' of Zen patches provides info that Zen is finally a 4 ALU + 2 AGU + 2 SIMD with 32KB L1 and 256KB L2. And each SIMD unit is 128bit FMA



If that is accurate my prediction [1] of the SIMD wide and FMA units was right, which implies Zen is a 16 FLOP arch, as I expected.

I also got right the total number of integer/mem pipes, but I had predicted 3ALU + 3AGU [1], instead 4ALU + 2AGU.

Albeit I finally proposed a 3ALU+3AGU configuration for Zen, I asked David Kanter in this forum about the possibility of Zen using an 4ALU+2AGU configuration, when the Internet was full with the slides (those slides that latter I showed to be fake [2]). The discussion was:

> I have a question, I predicted 3ALU+3AGUs and the leaked diagram shows six integer
> pipes. Do you believe a 4ALU+2AGU would be a better combination or not?

3 AGU + 3 ALU is a much better mix. Remember that x86 is load+op, so generally you want to sustain nearly a 1:1 ratio of memory to ALU operations. Haswell and Broadwell have extra ALUs to handle branches, etc.

2 AGUs + 4 ALUs would be rather disappointing and also at a severe disadvantage for HPC to Intel.

David


Full analysis with further details:

http://dresdenboy.blogspot.com.es/2015/10/amds-zen-core-family-17h-to-have-ten.html


[1] http://semiaccurate.com/forums/showpost.php?p=235170&postcount=219

[2] http://juanrga.com/en/the-fake-zen-slides.html
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