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September 8, 2021 02:19 am GMT
Imagine a literal bus driving around a city block, picking up and dropping off people between four buildings. The "bus" here resembles a strobe, the buildings resemble components (cores, uncore, etc.,) while the the bus-stops are ring-stops. Each component has its ring-stops. To disable components (eg: in product-stack segmentation), SKU designers simply disable ring-stops, making the component inaccessible. A bi-directional Ring Bus would see two "vehicles" driving in opposite directions around the city block. The Ring Bus topology comes with limitations of scale, mainly resulting from the latency added from too many ring-stops. This is precisely why coaxial ring-topology faded out in networking.
Original Link: https://www.techpowerup.com/286449/zen-3-chiplet-uses-a-ringbus-amd-may-need-to-transition-to-mesh-for-core-count-growth
"Zen 3" Chiplet Uses a Ringbus, AMD May Need to Transition to Mesh for Core-Count Growth
AMD's "Zen 3" CCD, or compute complex die, the physical building-block of both its client- and enterprise processors, possibly has a core count limitation owing to the way the various on-die bandwidth-heavy components are interconnected, says an AnandTech report. This cites what is possibly the first insights AMD provided on the CCD's switching fabric, which confirms the presence of a Ring Bus topology. More specifically, the "Zen 3" CCD uses a bi-directional Ring Bus to connect the eight CPU cores with the 32 MB of shared L3 cache, and other key components of the CCD, such as the IFOP interface that lets the CCD talk to the I/O die (IOD).Imagine a literal bus driving around a city block, picking up and dropping off people between four buildings. The "bus" here resembles a strobe, the buildings resemble components (cores, uncore, etc.,) while the the bus-stops are ring-stops. Each component has its ring-stops. To disable components (eg: in product-stack segmentation), SKU designers simply disable ring-stops, making the component inaccessible. A bi-directional Ring Bus would see two "vehicles" driving in opposite directions around the city block. The Ring Bus topology comes with limitations of scale, mainly resulting from the latency added from too many ring-stops. This is precisely why coaxial ring-topology faded out in networking.
Original Link: https://www.techpowerup.com/286449/zen-3-chiplet-uses-a-ringbus-amd-may-need-to-transition-to-mesh-for-core-count-growth
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