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Old 18th February 2012
LightBit LightBit is offline
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Default Kernel memory usage

I compared memory usage of FreeBSD and OpenBSD kernel (only base stuff running like init, ttys ...).

uncompressed kernel size: 13.8MB ( + 46.3MB of modules)
memory usage: 20MB

uncompressed kernel size: 8.6MB (no modules)
memory usage: 34MB

Why FreeBSD with bigger kernel uses less memory than OpenBSD?
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Old 19th February 2012
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Carpetsmoker Carpetsmoker is offline
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Use ps(1) and/or top(1) to see where the memory is going.

On FreeBSD, you can also use kldstat(1) to get some info on the kernel, use the -v flag, I *think* the size column in the size in bytes (Values seem about right on my system, but I didn't check it!).
OpenBSD doesn't have kldstat, I'm not sure how to get this information on OpenBSD.
UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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