From what I understand, upcoming Zen 2 technology keeps introducing the same inter CCX latency. That seems much more energy- & latency- efficient. That came in as a surprise and wonder if Zen 2+ will finally be 8-core CCX for another leap in performance. One resource I highly recommend is the book Upgrading a...There will be instances where that 32MB of L3 will be more like 16MB of L3 due to duplicate data across both CCX.Nontheless, adding more cache seems help greatly in the latency departmentm, but I can't wait to test Win 10 latest updates that FINALLY tackled their issues with their scheduler.Intel will soon be entering the discrete graphics card ...The best gaming headset I'm also looking for No online members at the momentI wonder why you want a console instead of a computer? Guess I forgot to revert that before pushing the github release.The really cool thing with Zen 2 is that that latency between 2 CCXs doesn't really change even if one CCX is on another chiplet. Lives for gear .
Basically, IF links does not increase linearly with core count. WtfChart image in case Google docs doesn't display it correctly for you:Manual Per CCX OC (4.5/4.4/4.375/4.375) with CPPC mask and preferred cores disabled.I was curious how FCLK affects the latency, and so I tested this for Zen, Zen+, and Zen 2. I don't foresee AMD increasing ccx size so long as they use infinity fabric as the data fabric for their CPUs.Well, it sounds like 8 cores and below will only be using a single chiplet, so none of this crossing chiplet business to get 8 core out of two salvaged chiplets.I imagine the 4+4 is simply because that's what they've done so far.
These values do not appear to change with FCLK or memory clock.I'm very much sure that "other CCX" isn't very correct.Note that the FCLK step between results changes at 1333 and 1866. To date, AMD has launched Desktop Ryzen 3000, Threadripper 3000, and EPYC 7002 (Rome) with Zen 2 cores.
That came in as a surprise and wonder if Zen 2+ will finally be 8-core CCX for another leap in performance.Check out/p> Their forum has knowledgeable buyer's gu...It isn't that surprising if you understand a little bit about infinity fabric and die complexity.
Even disregarding power and frequency, the ability to put structures into silicon and then integrate that silicon into the package, as well as providing power to the right parts of the silicon through the right connections becomes an exercise in itself.
Renoir: Latency, Caching, and Turbo Chiplets vs Monolithic. Discussion .
Moving down in node size brings up a number of challenges in the core and beyond. I have been thinking about how Ryzen's CCX latency (the latency between two cores on different chips connected by the infinity fabric) has been called into question regarding weird performance issues, particularly in gaming.
The tool also measures latency between the 2 SMT threads on the same core, and another core on the same CCX. ...The 8-core Chiplets are for the 3950X and Epyc cpus.As we all tought Zen 2's CCX would have been 8-core, AMD's is surprising us by showing up a slide where we can see the 2-CCX per chiplet containing 4-cores each. I could only tighten my timings so much at 3800: Inner-CCX: 30.9. Nontheless, adding more cache seems help greatly in the latency departmentm, but I can't wait to test Win 10 latest updates that FINALLY tackled their issues with their scheduler. Someone on another forum figured it out back when zen1 dropped. 27th December 2018 #1. poshook .
It's really impressive!Can you test Inter-CCX and chiplet to chiplet?Edit: Found one of the posts that made me curious about how FCLK affected the latency:Might explain the desire for 2X the cache to alleviate that bottleneck. CCX to CCX goes through IO die no matter on which chiplet the CCX isThe tool also measures latency between the 2 SMT threads on the same core, and another core on the same CCX. In a few of the Ryzen reviews I noticed they had tests showing the latency to communicate with cores in a different CCX. For Zen 2 I kept the memory clock equal to FCLK for consistency. I'm doing good on CCX latency, but not amazing on memory latency.
My Studio.
A 4 core ccx requires something like 6 IF links to allow inter-ccx communication.
AMD gave us some insight into how 7nm changed some of its designs, as well as the packaging challenges … This is responsible for the change in slope.x2, for exactly the reason of the table from that other post3900x, otherwise stock but memory at 3600MHz cl18, so 1800MHz infinity fabric.Thanks for spotting that! Doubling L3$ is a good stop gap solution to decrease inter core communication latency since you can store more in cache closer to the cores that need the data.
Inter-CCX: 68.6 Finally it shows how long the same computation takes with a single thread.
Size Latency Increase Description 32 K 4 64 K 8 4 + 8 (L2) 128 K 10 2 256 K 11 1 512 K 12 1 1 M 26 14 + 26 (L3) 2 M 37 11 + 7 (L1 TLB miss) 4 M 41 4 8 M 43 2 16 M 44 + 6 ns 1 + 6 ns 32 M 45 + 41 ns 1 + 35 ns + 66 ns (RAM) 64 M 73 + 55 ns 28 + 21 ns + 56 (L2 TLB miss)
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