How do I limit the amount of ram to 1536M?

[DingbatCA]

How do I limit the amount of ram to 1536M?
The system has 4096M I want the system to only see 1536M

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cat /proc/meminfo 
MemTotal:      3556296 kB
...

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title Gentoo 2.6.30-gentoo-r1
root (hd0,0)
kernel /linux-2.6.30-gentoo-r1 root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 mem=1536M max_cpus=2

[Roman_Gruber]

Hi,

You are right its a boot parameter, but I think its mem, ...
Sry I also have to check google now

[DingbatCA]

Any luck?

[poly_poly-man]

any reason why?

[jongeek]

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title Gentoo 2.6.30-gentoo-r1
root (hd0,0)
kernel /linux-2.6.30-gentoo-r1 root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 mem=1536M max_cpus=2

The kernel line in your grub config should work fine. I've used the "mem=" option on a couple of machines to test low-memory conditions. I just tested on a box in my cube, and it worked fine. Its also listed in /usr/src/linux/Documentation/kernel-parameters.txt.

What does

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cat /proc/cmdline

say after you've booted using the grub config you listed ?

[DingbatCA]

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cat /proc/cmdline 
root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 selinux=0

WTF?!

[jongeek]

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title Gentoo 2.6.30-gentoo-r1
root (hd0,0)
kernel /linux-2.6.30-gentoo-r1 root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 mem=1536M max_cpus=2

What else is in your grub config ? Can you post the whole file ?

[DingbatCA]

cat /boot/grub/grub.conf

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default=0
serial --unit=0 --speed=38400
terminal --timeout=2 console serial

title Gentoo 2.6.30-gentoo-r1
root (hd0,0)
kernel /linux-2.6.30-gentoo-r1 root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 mem=1536M max_cpus=2 

cat /proc/cmdline

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root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 selinux=0

Why is my mem argument and my CPU argument not working, not even showing up!

[jongeek]

You don't happen to also have LILO installed, do you ? I can't think of any reason why your grub config would not be honored, unless it is not grub that is booting your system.

[DingbatCA]

This is a clean install. So there are no strange packages installed.

[jongeek]

Bizarro. Two other things I thought of.

1) Is menu.lst a symlink pointing to grub.conf (the way it should be), or are they two separate files ? Maybe its not reading the grub.conf you think it is.

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ll /boot/grub/menu.lst
lrwxrwxrwx 1 root root 9 2008-11-07 08:49 /boot/grub/menu.lst -> grub.conf

2) Do you have more than one Linux install on your computer ? Its possible grub is reading the grub.conf from a different partition if you have some sort of multi-boot setup.

Neither of these sound likely from what you've posted, but I'm grasping at straws here.

[DingbatCA]

single boot, nothing special

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ls -la /boot/grub/ | grep menu.lst
lrwxrwxrwx 1 root root     11 Aug 18 16:51 menu.lst -> ./grub.conf

[platojones]

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cat /proc/cmdline 
root=/dev/md3 vga=0x318 console=tty0 console=ttyS0,38400 selinux=0

WTF?!

It's pretty obvious it dropped the second line....looks to me like you have a newline character at the end of the first line...put it all on one line and let it wrap.

[cyrillic]

HINT : Look at your grub.conf with /boot mounted, then look at your grub.conf with /boot unmounted.