topic Re: Processor problem in Operating System - Linux

Processor problem

AnthonySN — Mon, 29 Jan 2007 10:13:36 GMT

We have installed RHEL AS 3 update 8 on a DL380 G4 server having dual processor.
8 GB ram,Smart array controller card 6i
having one logical partition with Raid 5.
problem is that in the top command it shows only one processor even though there are two processors
Pls find the log files attached.

Re: Processor problem

Vitaly Karasik_1 — Mon, 29 Jan 2007 10:44:15 GMT

do use use some special parameters for grub boot loader (acpi, ...)??

Re: Processor problem

AnthonySN — Mon, 29 Jan 2007 10:53:54 GMT

I did a normal install using defaults
do u mean i should reintall the os, can't do it since they have already installed their application on it.

Re: Processor problem

Ivan Ferreira — Mon, 29 Jan 2007 11:05:35 GMT

Reinstall Never! Just was asking for some kernel boot parameters used, you can identify the parameters used in /proc/cmdline.

This information was extracted from an MS article but can apply also:

Compaq Proliant multiple-processor computers have a Complimentary Metal-Oxide Semiconductor (CMOS) setting that specifies the operating system. If this setting is set to Other, Setup detects only one processor. This occurs because the Advanced Configuration and Power Interface (ACPI) setting is disabled. Compaq SMP-based servers require that the appropriate operating system is configured in CMOS to see all processors correctly.

Re: Processor problem

AnthonySN — Mon, 29 Jan 2007 23:33:25 GMT

The CMOS setting is set to other since there is no option for RED hat os.
how do I configure the appropriate OS since we are not able to see the option for red hat.

Re: Processor problem

Vitaly Karasik_1 — Tue, 30 Jan 2007 02:20:30 GMT

As far as I remember you can choose "linux" in BIOS.

Re: Processor problem

Ralph Grothe — Tue, 30 Jan 2007 10:48:57 GMT

Hi Athonys,

silly question,
when you are in top, did you type "1" to toggle from single (averaged) CPU to SMP mode?
Usually you should notice a change in the header, and every CPU (core) appears with an own line.
Besides, a "less /proc/cpuinfo" should list an entry for every CPU core.

# grep processor /proc/cpuinfo
processor : 0
processor : 1
processor : 2
processor : 3

Re: Processor problem

AnthonySN — Tue, 30 Jan 2007 23:38:38 GMT

when you are in top, did you type "1" to toggle from single (averaged) CPU to SMP mode?
Usually you should notice a change in the header, and every CPU (core) appears with an own line.
Besides, a "less /proc/cpuinfo" should list an entry for every CPU core.

# grep processor /proc/cpuinfo
processor : 0
processor : 1
processor : 2
processor : 3

Attached is the output of the /proc/cpuinfo, uname -a and /proc/meminfo.

Re: Processor problem

Vitaly Karasik_1 — Wed, 31 Jan 2007 03:06:16 GMT

well - "/proc/cpuinfo" was in the first letter. linux uses only one CPU.

Anthonys , did you try to set "linux OS" in the BIOS?

Re: Processor problem

Vitaly Karasik_1 — Wed, 31 Jan 2007 03:06:31 GMT

well - "/proc/cpuinfo" was in the original post. linux uses only one CPU.

Anthonys , did you try to set "linux OS" in the BIOS?

Re: Processor problem

AnthonySN — Sun, 18 Feb 2007 08:20:10 GMT

Thanks everyone for your precious time.
Thanks to IVAN,
I cross checked and found out that the APIC setting in the bios was set to disabled.
now the os can sense all the cpu's.
but there is no option where we can select Linux as the OS

rgds,
Anthony.

Re: Processor problem

AnthonySN — Sun, 18 Feb 2007 08:21:16 GMT

Set the APIC in the BIOS to enabled for the OS to sense all the cpu's