mem size at bootup

mem size at bootup

[Yaoping Ruan]

Hello,

could anybody tell me if there's any option to specify the size of
memory I want to use in Linux. We have a box with 4GB memory but we
would like to run some experiment with only 2GB memory. Is there any
option like the "hw.physmem" in FreeBSD?

Thanks a lot

- Yaoping Ruan

Re: mem size at bootup

[Dave Hansen]

On Fri, 2003-10-24 at 12:59, Yaoping Ruan wrote:
> could anybody tell me if there's any option to specify the size of
> memory I want to use in Linux. We have a box with 4GB memory but we
> would like to run some experiment with only 2GB memory. Is there any
> option like the "hw.physmem" in FreeBSD?

mem= on the kernel command-line.

In lilo, you do something like this:
image=/boot/vmlinuz-2.4.20
	label=2420
	read-only
	optional
	append="mem=2G"

-- 
Dave Hansen
haveblue@us.ibm.com

Re: mem size at bootup

[Richard B. Johnson]

On Fri, 24 Oct 2003, Yaoping Ruan wrote:

> Hello,
>
> could anybody tell me if there's any option to specify the size of
> memory I want to use in Linux. We have a box with 4GB memory but we
> would like to run some experiment with only 2GB memory. Is there any
> option like the "hw.physmem" in FreeBSD?
>
> Thanks a lot
>
> - Yaoping Ruan

	mem=16M

...on the LILO command-line will tell Linux to use only 16 megabytes.
You hit the [Alt] key during boot to get to the LILO command-line.
Then you can hit the [Tab] key to see the available systems to boot.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.