Why do AMD Opteron 6200 "Bulldozer" Processors show the incorrect number of CPU cores?

Solution Verified - Updated -

Issue

  • AMD Opteron 6200 "Bulldozer" processors have 16 cores. However on RHEL 6, it is showing cpu cores = 8.
Raw
# cat /proc/cpuinfo

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 21
model           : 1
model name      : AMD Opteron(TM) Processor 6272
stepping        : 2
cpu MHz         : 2094.698
cache size      : 2048 KB
physical id     : 0
siblings        : 16
core id         : 0
cpu cores       : 8
apicid          : 32
initial apicid  : 0
  • RHEV 3's vdsm shows half the expected cores on a system with 12 cores:
Raw
vdsClient -s 0 getVdsCapabilities | grep cpuCores
    cpuCores = 6

Environment

  • Red Hat Enterprise Linux 6
  • AMD Bulldozer-based Opteron 6200 "Interlagos" processor

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