I have a system with 4GB RAM and hence need to use an amd64 kernel to use all the RAM (I can only access 3GB RAM with an i386 kernel). OTOH, amd64 processes are significantly (50-100%) larger than equivalent i386 processes and none none of the applications I'll be running on the system need to be 64-bit.
This implies that the optimal approach is an amd64 kernel with i386 userland (I'm ignoring PAE as a useable approach). I've successfully run i386 jails on amd64 systems so I know this mostly works. I also know that there are some gotchas: - kdump needs to match the kernel - anything accessing /dev/mem or /dev/kmem (which implies anything that uses libkvm) probably needs to match the kernel. Has anyone investigated this approach? -- Peter Jeremy
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