Thank you all for helping. It was set 1 as default in grub.conf. So it was not PAE kernel which has boot the machine. After changing it to 0, it was posible to boot from kernel-PAE. Then it detected all 8GB memory.
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
password --md5 $1$WQ5dGY01$sY5Z0f5KoBgaSlJ8tR9uv1
title CentOS (2.6.18-164.11.1.el5PAE)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.11.1.el5PAE ro root=/dev/VolGroup00/LogVol00
initrd /initrd-2.6.18-164.11.1.el5PAE.img
________________________________
From: Gaveen Prabhasara <gaveens@???>
To: Yasantha Uggallage <yasanthau@???>
Cc: linux@???
Sent: Mon, February 8, 2010 2:35:06 PM
Subject: Re: [linux] Linux wont detect additional memory
Hi,
Naturally the 1st workaround I recall is to install the kernel-PAE and see how
it goes from there. Your output is for the non-PAE kernel. Can you provide
the output when booted from the PAE kernel?
PAE is for 32-bit systems and was available in RHEL/CentOS 5. If you try
an older (i.e.: 3/4) system you'll need the hugemem kernel.
--
Gaveen Prabhasara
On Mon, Feb 8, 2010 at 2:18 PM, Yasantha Uggallage <yasanthau@???> wrote:
Hi All,
>
>Installed CentOS 5.3 on a HP DL320 (G6X3210) server and it had 4 GB of memory initially. Then after installing OS and other software, memory was upgraded by another 4GB totaling all memory to 8GB. The total memory is shown in BIOS too. But it is not detected to Linux. Additional 4GB is not shown for total memory.
>
>[root@test~]# free -m
> total used free shared buffers cached
>Mem: 3417 1069 2347 0 21 414
>-/+ buffers/cache: 633 2783
>Swap: 4031 0 4031
>
>Following info can be seen on messages log.
>
>Feb 8 18:12:27 mail syslogd 1.4.1: restart.
>Feb 8 18:12:27 mail kernel: klogd 1.4.1, log source = /proc/kmsg started.
>Feb 8 18:12:27 mail kernel: Linux version 2.6.18-164.6.1.el5 (mockbuild@???) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Tue Nov 3 16:18:27 EST 2009
>Feb 8 18:12:27 mail kernel: BIOS-provided physical RAM map:
>Feb 8 18:12:27 mail kernel: BIOS-e820: 0000000000010000 - 000000000009f400 (usable)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 0000000000100000 - 00000000d7e66000 (usable)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000d7e66000 - 00000000d7e6e000 (ACPI data)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000d7e6e000 - 00000000d7e6f000 (usable)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000d7e6f000 - 00000000d8000000 (reserved)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000fec00000 - 00000000fed00000 (reserved)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
>Feb 8 18:12:27 mail kernel: BIOS-e820: 0000000100000000 - 0000000227fff000 (usable)
>Feb 8 18:12:27 mail kernel: Warning only 4GB will be used.
>Feb 8 18:12:27 mail kernel: Use a PAE enabled kernel.
>Feb 8 18:12:27 mail kernel: 3200MB HIGHMEM available.
>Feb 8 18:12:27 mail kernel: 896MB LOWMEM available.
>Feb 8 18:12:27 mail kernel: found SMP MP-table at 000f4f80
>Feb 8 18:12:27 mail kernel: Memory for crash kernel (0x0 to 0x0) notwithin permissible range
>Feb 8 18:12:27 mail kernel: disabling kdump
>
>Installed kernel-PAE and boot the server from that kernel. But no success.
>
>Is there any other workaround for this issue?
>
>Thank you.
>
>
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