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Home > Linux > AMD x2APIC now supports up to 511 vCPUs on KVMs

AMD x2APIC now supports up to 511 vCPUs on KVMs

AMD has sent new patches for x2APIC virtualization support on Linux, increasing the vCPU limit to 511.


Rusen Gobel Rusen Gobel
February 22, 2022
1 min read
AMD x2APIC now supports up to 511 vCPUs on KVMs

The CPU giant AMD is enhancing its current CPUs for better virtualization support with new drivers on Linux. The changes on the CPUs are focusing on its x2APIC virtualization capabilities for kernel-based virtual machines, KVMs.

From 255 cores to 511 cores

The new code enables using all of the cores in a dual EPYC system

The company has sent new codes for Linux regarding the x2APIC virtualization support. The old code was supporting up to 255 virtual CPUs, 1 is reserved for the host operations. In AMD’s current EPYC CPU lineup, some products can fill up those virtual CPUs alone with its 128 cores and 256 threads inside.

The upcoming Zen 4 EPYC family currently have a maximum of 128 core member, Bergamo. It might seem to be enough to have 255 virtual CPU support. However, in the data center industry, double-socket motherboards are widely used. Double 128 core CPUs mean a total of 256 cores and 512 threads, which makes the KVM support / maximum virtual CPU number insufficient.

With the new code that AMD engineers sent for Linux, KVMs can get up to 511 virtual CPUs, 1 core is reserved for the host operations again. In addition, the code should enable better efficiency as well.

See more Linux News

A comprehensive guide to understanding Linux: What is Linux?


Tags: Advanced Micro Devices (AMD)
Rusen Gobel

Rusen Gobel

Rusen Gobel is the managing editor of Cloud7. With more than 10 years of experience, Rusen worked as a hardware and software news editor for technology sites such as ShiftDelete, Teknokulis, Hardware Plus, BT Haber. In addition, Rusen publishes consumer product reviews on his YouTube channel. While consumer electronics has been his main focus for years, now Rusen is more interested in WordPress and software development. He had contributed different web application projects in his professional career. Rusen had graduated from Istanbul University, department of Computer Engineering. Rusen has a very high passion for learning and writing for every kind of technology. That's why he has been working as a tech editor for more than ten years on several different technology magazines and online news portals.

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