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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