Next Generation Intel Atom Tremont: Potential L3 Cache
by Dr. Ian Cutress on July 15, 2019 8:00 AM EST
Intel has already disclosed that it will have a next generation Atom core, code named Tremont, which is to appear in products such as the Foveros-based hybrid Lakefield, as well as Snow Ridge designed for 5G deployments. In advance of the launch of the core and the product, it is customary for some documentation and tools to be updated to prepare for it; in this case, one of those updates has disclosed that the Tremont core would contain an L3 cache – a first for one of Intel’s Atom designs.
01.org is an Intel website which hosts all of its open source projects. One of those projects is perfmon, a simple performance monitoring tool that can be used by developers to direct where code may be bottlenecked by either throughput, memory latency, memory bandwidth, TLBs, port allocation, or cache hits/misses. In this case, the profiles for Snow Ridge have been uploaded to the platform, and one of the counters provided includes provisions for L3 cache monitoring. This provision is directly listed under the Tremont heading.
Enabling an L3 cache on Atom does two potential things to Intel’s design: it adds power, but also adds performance. By having an L3, it means that data in the L3 is quicker to access than it would be in memory, however there is an idle power hit by having L3 present. Intel can mitigate this by enabling parts of the L3 to be powered on as needed, but there is always a tradeoff. There can also be a hit to die area, so it will be interesting to see how Intel has changed the microarchitecture of it’s Atom design. There is also no indication if the Tremont L3 cache is an inclusive cache, or a non-inclusive cache, or if it can be pre-fetched into, or if it is shared between cores or done on a per-core basis.
Intel’s Atom roadmap, as disclosed last year at Architecture day, shows that the company is planning several more generations of Atom core, although beyond Tremont we get Gracemont in 2021, and beyond that is ‘increased ST Perf, Frequency, Features’ listed around 2023. In that time, Intel expects to launch Sunny Cove, Willow Cove, and Golden Cove on the Core side.
Lakefield
The first public device with Tremont inside is expected to be the Core/Atom hybrid Lakefield processor, which uses Intel’s new Foveros stacking technology. We know that this design will have one Sunny Cove core and pair it with four Tremont cores. Intel expects chip production of Lakefield for consumer use by the end of the year.
Related Reading
- Intel's Architecture Day 2018: The Future of Core, Intel GPUs, 10nm, and Hybrid x86
- Intel Lists New Atom Core: Tremont to Come After Goldmont Plus
- Intel’s Keynote at CES 2019: 10nm, Ice Lake, Lakefield, Snow Ridge, Cascade Lake
- Intel's Interconnected Future: Combining Chiplets, EMIB, and Foveros
Source: InstLatX64, 01.org
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abufrejoval - Tuesday, July 16, 2019 - link
I understood the first part.But I would not have thought that these issues are over *and* that chips are being delivered to OEMs again: It takes a while for chips to go through fabs and into finished products, I'd say months of lead-time.
And it's not like Gemini Lake were generally available all over the place. I really only found one source and it only had a few.
In any case I count myself lucky I found and got them: They are really nice IT Lego bricks, when VMs or containers won't do!
mode_13h - Wednesday, July 17, 2019 - link
Well, I don't really know what the supply situation is like, but Odroid H2's have been back in stock for a while, I believe.Lord of the Bored - Monday, July 15, 2019 - link
"beyond that is ‘increased ST Perf, Frequency, Features’ listed around 2023."Worst codename ever.
mode_13h - Monday, July 15, 2019 - link
Actually, if you look at the slide, the codename for the 2023 core is "'Next' Month". Probably a spellcheck autocorrect error, as they obviously meant "'Next' Mont".IMO, NextMont wouldn't be so bad, except I don't know what you'd call the one after that. Kinda like GCN...
HStewart - Monday, July 15, 2019 - link
Somebody has the wrong document for - if you search for 2018 Architexture Day you can find a document and it states "Next Mont" not "next Month",https://www.servethehome.com/wp-content/uploads/20...
Ian Cutress - Tuesday, July 16, 2019 - link
At the presentation photo vs after presentation edited slide deckQasar - Tuesday, July 16, 2019 - link
if i search for " 2018 Architexture Day " all i find are articles that have nothing to do with cpus., but if i search for 2018 Architecture Day " then i find some articles about cpus... looks like hstewart STILL doesnt know how to spell it right.HStewart - Tuesday, July 16, 2019 - link
Wrong all I indicating that there is at least one place that does not have "Next Month" but "Next Mont" - somebody is play joke on words to stating that the like next month, joking about Intel recent time problems on meeting schedule. Recent means last two years of so.I not saying it bad here and not saying which one is correct from Intel. But I serious doubt Intel has "Next Month".
Lord of the Bored - Wednesday, July 17, 2019 - link
No one is making jokes about Intel's scheduling issues. Just making fun of their typo.mode_13h - Wednesday, July 17, 2019 - link
So, you're refuting Ian's claim that he took the photo AT THE EVENT?Spell check autocorrect is a far more plausible explanation than Intel trying to make a joke (which doesn't even make much sense, let along seem particularly funny), in their actual presentation.