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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
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.