Re: [linux] Linux wont detect additional memory

i guess your are using 32bit system
try kernel-PAE OR get the CentOS x86-64

*kernel-PAE* (x86-only): Contains a kernel with support for 64GB of memory
on x86 systems through Physical Address Extensions (PAE). Only x86 CPUs that
support PAE can run this kernel. This kernel is provided because x86 systems
can't address more than 4GB of memory without PAE extensions.

http://en.wikipedia.org/wiki/Physical_Address_Extension


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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>

-- 
Danishka Navin
http://danishkanavin.blogspot.com

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