hi,

i am relatively new to linux memory.
is it possible to use 512mb DDR2 as 64mb DDR2?
i need a smaller memory size for my project, but i couldn't find such small size ddr2.
any suggestion?
thanks in advance.

Try installing and running qemu with the memory option as such:
You may need to specify the --no-kqemu option if the driver is built.
Use blackbox as a desktop and run qemu from the terminal leaving nothing else running. You should have 128M free to use if not more.
Build the distribution from source and add only the mods you need.
You can copy the finished image to a usb key and add a configuration script to run it using the values you want.

...Why?...
why dont you use Sun VirtualBox - you can set the memory from 4 to 1000 MB!

First thing, Virtualbox uses qemu and will use a virtual memory buffer that will add available memory to the virtual machine.
Second, VirtualBox is limited on the CPU architecture it can emulate or access, qemu does not have this limit.
Third, if he/she is building a project, the command line is the best way to do that.
Fourth, loaded modules will affect performance, possibly slowing down the machine. Qemu can also access drives by using the -hdX and -cdx codes on the command line.
Fifth, the images can be ported to any OS that runs qemu- including macintosh- file format of the image changed, or written to a cd.

thanks for your suggestions to use any virtual machine ideas. for my project, i decided a while ago, when the project started, not to use any virtual tech. my project is about benchmarking 3rd party software. i should have mentioned this in my initial posting.

is there any switch that one can adjust or tweak so that a fedora box only use 128mb out of 512mb that is installed?

thanks

Hi

You can also pass MEM=128M as kernel parameter when you boot.

The memory soltuion is either:
A) Follow kusanagiyang's advice.
B) Use qemu with a limited memory option. Don't install kvm or kqemu.
You'll need to install an environment that uses fewer resources.

1 members found this post helpful.

this parameter makes a linux box behave in exact same manner such as only 128mb of memory is installed. in other words, to linux and softwares running upon, there is no distinction between actually 128mb of memory is installed, and other sizes memory with 'mem=128M' parameter.

please correct me if i am wrong.
thanks again

Yes.

I googled it a bit, and I found this link:

http://redsymbol.net/linux_boot_parameters/

Sorry I'm not sure if I really understood this, but I guess if it crashes, you will need to use a memmap parameter as well.

1 members found this post helpful.

Use the qemu option, so that you can have a system.