Broadcom Vulcan

By: Brett (ggtgp.delete@this.yahoo.com), March 7, 2015 1:56 pm
Room: Moderated Discussions
juanrga (nospam.delete@this.juanrga.com) on March 6, 2015 6:22 pm wrote:
> I don't expect K12 to be significantly better than Vulcan.

Is that per thread? Vulcan is 4 way threaded. Per die size, MIPS/watt?
Vulcan slides show 8 fetch, 4 issue, 60 entry scheduler, 6 ports, unknown completion.

High end chips tend to be 6 decode, 6 issue, 192 entry scheduler, ~8 ports, 6 completion.

The 4 issue sticks out like a sore thumb, I hope there is some opcode merging going on. I also hope that scheduler is not shared four ways, it is to small to be competitive as is. The previous MIPS chip with similar specs was tiny, you can put lots of them on a die, and win benchmarks that way.

On the good side it does have three load/store ports, supporting 2 loads or 3 stores, which sounds backwards to me, most code has more loads than stores.
https://hpcuserforum.com/presentations/santafe2014/Broadcom%20Monday%20night.pdf

I am really expecting K12 to be wider than Bulldozer.
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