One thing to look out for is that if you're using "xntpd" to keep your
machine synchronized to the network, then it will mlock() itself into
memory, and at least for me that means that about 1.2MB of your memory
is completely untouchable by the kernel.
That, together with the kernel itself using about a megabyte or so of
memory, made a 4MB test machine completely unrunnable for me. Also
verify that you aren't trying to profile the kernel you're running,
because that will eat up another half meg of unswappable memory...
Linus
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