AMD just released the first Linux kernel patch to allow monitoring of its next-gen Epyc Genoa server processors. The 4th Gen Epyc chips will feature a total of up to 96 cores across 12 CCDs. At present, the k10temp Linux driver for temperature monitoring of AMD CPUs can read a total of up to eight CCDs or 64 cores, making it necessary to update the kernel to support the newer processors.
The latest Linux patch explicitly says: “The newer AMD Family 19h Models 10h-1Fh and A0h-AFh can support up to 12 CCDs. Update the driver to read up to 12 CCDs.“
The AMD Family 19h models represent the next-gen Zen 4 processors. In addition to confirming the overall core count of 96 for Genoa, this also indicates that the overall CCD structure will remain unchanged with Zen 4. We will, once again, be seeing eight-core chiplets, and a total of up to 24 cores or 3 CCDs for the desktop Zen 4 Ryzen lineup.
AMD’s Bergamo processors featuring the Zen 4c cores are slated to arrive a few quarters after Genoa. They’ll feature up to 128 cores, and additional memory channels compared to Genoa. Furthermore, they’ll likely feature sixteen core CCDs [not confirmed], resulting in an overall CCD count of 8. The L3 cache will be trimmed to make space for the additional cores.
Featuring the Zen 4 architecture, and TSMC’s N5 (5nm EUV) process node, the next-gen Ryzen/Epyc lineups are slated to arrive in the second half of 2022