Can't See Full Memory On Server

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technick
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Can't See Full Memory On Server

I just installed CentOS 4.2 on a IBM Server loaded out with 16 gigs of memory. CentOS comes up and recognizes 8 gigs of memory only. I googled it and came across the kernel-hugemem. I am still having the same problems running on the hugemem kernel.

The bios see's all 16 gigs of memory so I know it's there.

Thanks in advance.

Nick

[root@vs1 ~]# uname -r
2.6.9-34.ELhugemem
[root@vs1 ~]# free
total used free shared buffers cached
Mem: 8032148 96204 7935944 0 12032 32428
-/+ buffers/cache: 51744 7980404
Swap: 16386292 0 16386292
[root@vs1 ~]#

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permalink · 2006-05-17 11:44:00 · Print ·

BeesTea
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1 edit

Re: Can't See Full Memory On Server

You need to enable the CONFIG_HIGHMEM64G option for your kernel.

You can test if it's set

$ sudo zgrep -i HIGHMEM /proc/config.gz
# CONFIG_NOHIGHMEM is not set
CONFIG_HIGHMEM4G=y
# CONFIG_HIGHMEM64G is not set
CONFIG_HIGHMEM=y

or

grep -i HIGHMEM /usr/src/your_kernel/.config

EDIT: Just noticed that you said it sees 8GB already, that implies it might already be set. Worth checking though.
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permalink · 2006-05-17 18:51:32 ·

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