topic Where is my memory in Operating System - Linux

Where is my memory

Sac_3 — Mon, 17 Sep 2007 14:16:20 GMT

[root@TEST]# free
total used free shared buffers cached
Mem: 3858640 3846424 12216 0 66880 3477332
-/+ buffers/cache: 302212 3556428
Swap: 4194232 1328 4192904

But the memory on the server is 12 GB.

Below are the details of the server:

hpasmcli> SHOW SERVER
System : ProLiant DL580 G2
ROM version : P27 09/02/2004
iLo present : Yes
Embedded NICs : UNKNOWN

Processor: 0
Name : Intel Xeon
Stepping : 6
Speed : 3000 MHz
Bus : 100 MHz
Socket : 4
Level2 Cache : 512 KBytes
Status : Ok

Processor: 1
Name : Intel Xeon
Stepping : 6
Speed : 3000 MHz
Bus : 100 MHz
Socket : 3
Level3 Cache : 4096 KBytes
Status : Ok

Processor: 2
Name : Intel Xeon
Stepping : 6
Speed : 3000 MHz
Bus : 100 MHz
Socket : 2
Level2 Cache : 512 KBytes
Status : Ok

Processor: 3
Name : Intel Xeon
Stepping : 6
Speed : 3000 MHz
Bus : 100 MHz
Socket : 1
Level3 Cache : 4096 KBytes
Status : Ok

Processor total : 4

Memory installed : 12288 MBytes
ECC supported : Yes

[root@TEST root]# uname -a
Linux TEST 2.4.21-32.EL #1 Fri Apr 15 21:29:19 EDT 2005 i686 i686 i386 GNU/Linux

Even though there are 4 cpu's i could c only 1 cpu in /proc/cpuinfo

cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Xeon(TM) MP CPU 3.00GHz
stepping : 6
cpu MHz : 2994.300
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 5976.88

Re: Where is my memory

Steven E. Protter — Mon, 17 Sep 2007 15:11:03 GMT

Shalom,

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1161688

The utility mem.mon can be used to show memory resident and virtual memory. You can use to to find out how many active processes and use this tool to get sorted memory use statistics on every process on your system.

SEP

Re: Where is my memory

Sac_3 — Mon, 17 Sep 2007 15:43:19 GMT

Hi SEP,

I suspect the problem could b with kernel type. If u check the uname -a output

Linux TEST 2.4.21-32.EL #1 Fri Apr 15 21:29:19 EDT 2005 i686 i686 i386 GNU/Linux

it is evident that the server was not rebooted with SMP kernel but with 2.4.21-32.EL due to which it failed to detect the rest of the 3 CPU's and additional memory.

Need your comments

SaC

Re: Where is my memory

skt_skt — Mon, 17 Sep 2007 21:48:41 GMT

i rember replying to a similar post where the CPU was not visible and got resolved after switching to smp.

"If the system is multiprocessor, then install the kernel-smp packages, and upgrade the kernel-utils packages"-

Re: Where is my memory

Bharath_Pingali — Tue, 18 Sep 2007 11:15:50 GMT

Hello Sac,

More information from RedHat website on Kernels and supported cpu/memory.

http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/sysadmin-guide/ch-kernel.html

#########################################
kernel-smp â contains the kernel for multi-processor systems. The following are the key features:

Multi-processor support

Support for more than 4 GB of RAM (up to 16 GB for x86)

PAE (Physical Address Extension), or 3 level paging on x86 processors that support PAE
##########################################

Hope this helps.

-Thank You
Bharath