Operating System - Linux
1820483 Members
2508 Online
109624 Solutions
New Discussion юеВ

RHEL not recognizing dual core CPU's

 
prakasse
Advisor

RHEL not recognizing dual core CPU's

Hi Folks,

We have installed RHEL 5.2 on HP rx6600. cat /proc/cpuinfo command says that there are 4 processor. But these processor are dual cores. So totally there are 8 cores.

What command in Linux will tell us that the total number of cores in then system is 8?

Correct answer will be awarded full points.

Thanks,
Senthil.
4 REPLIES 4
Ivan Ferreira
Honored Contributor

Re: RHEL not recognizing dual core CPU's

Can you please post the ouput of:

uname -r
cat /proc/cmdline

Have you started with an SMP kernel enabled?
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
Matti_Kurkela
Honored Contributor

Re: RHEL not recognizing dual core CPU's

I think you're a bit hasty in assuming that Linux does not detect the number of cores correctly.

http://www.redhat.com/rhel/compare/

Unless you're running RHEL 5 Advanced Platform, the problem is the number of physical CPUs. To support more than 2 physical CPU sockets, Advanced Platform version is mandatory.

2 physical CPUs allowed x 2 cores each = 4 CPU cores total available to the OS and applications.

Check the system boot messages. If they scrolled by too fast, run "dmesg | less". You may find that the kernel is trying to tell you exactly what the problem is.

MK
MK
Zinky
Honored Contributor

Re: RHEL not recognizing dual core CPU's

Only Redhat Linux Advanced Server (RHEL AS) supports more than 2 sockets regardless of the number of cores.

That is why we all wait for the Octo-Core Nehalems.

Hakuna Matata

Favourite Toy:
AMD Athlon II X6 1090T 6-core, 16GB RAM, 12TB ZFS RAIDZ-2 Storage. Linux Centos 5.6 running KVM Hypervisor. Virtual Machines: Ubuntu, Mint, Solaris 10, Windows 7 Professional, Windows XP Pro, Windows Server 2008R2, DOS 6.22, OpenFiler
prakasse
Advisor

Re: RHEL not recognizing dual core CPU's

Thanks.