Why all the cpu's are not coming online when system is booted with maxcpus=1 on system with Intel CPU

Solution Verified - Updated -

Issue

  • When the system is booted with maxcpus=1 all the CPU does not come online on a system with Intel CPUs.
# lscpu|grep ^O
On-line CPU(s) list:  0,23,55
Off-line CPU(s) list: 1-22,24-54

Environment

  • Red Hat Enterprise Linux 9.
  • Red Hat Enterprise Linux 8.
  • Intel CPUs

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content