New article: AMD's Jaguar Microarchitecture

Article: AMD's Jaguar Microarchitecture
By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), April 2, 2014 2:25 pm
Room: Moderated Discussions
WaltC (johnandsusanne333.delete@this.outlook.com) on April 2, 2014 1:52 pm wrote:
>
> ...but when it comes to Jaguar, the company was clearly constrained
> by a lack of budget and engineering resources.

>
> Clearly, and in comparison to whom...Intel? (Obviously.) Not only is that to be expected, but
> even so Intel has nothing comparable in this market sector, regardless of the disparity in budgets
> and resources.

What? The modern atom is actually very comparable to Jaguar.

Sure, Atom aims a bit lower, but not excessively so. Intel has their big cores (and have been pretty aggressive about lower-end "Pentium" Haswells), so aiming lower actually makes sense, because they already have the high- and middle-end solved.

Sure, the GPU that goes along with Jaguar is noticeably more powerful than the Atom GPUs, but aside from the game consoles, how much does that really matter?

On the CPU side, I'd like to see benchmarks comparing the two. Jaguar probably wins, but not likely by a huge amount - they are both dual-issue OoO, and judging by past efforts I suspect Atom has a faster L2 cache to somewhat make up for smaller instruction queues.

And as mentioned, Silvermont is aiming at the low end of Jaguar, since the high end is already covered. So the fastest Jaguar may outperform Silvermont, but does that matter when that space is where Intel would sell Haswell?

So I really don't understand your "nothing comparable" comment. It seems totally separated from reality.

Linus
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