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

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