> OpenBSD will just fit on 512 MB, including the compiler and docs.
> But that is just a bit too small when you do a recompile (due to files kept
> open by running processes).

A 512 Mb CF card is a bit painful. Many packages end up needing libraries
out of X (for example, the pfstat port needs X libs to draw its graphs). I
recommend at least 1 Gb, with a full install. I'd say a VM is probably the
best way to do builds.

> Oh, that sounds a bit discouraging. Isn't CF just a variant of the IDE
> bus, and should therefore be able to reach speeds of 33 - 133 MB/s
> depending on the controller. I realize that a caveat in the OpenBSD
> driver could slow things down, but all the way to 2MB/s ? I'm not saying
> you are wrong, I'm just surprised. Have you done some benchmarks?

It's not the bus, or OpenBSD's drivers. CF is just slow. This has a
negligible impact on firewall operation, a firewall bounces packets from
network port to CPU to network port without touching the disk. If you're
going to be doing anything ambitious on the flash, I'd be more concerned
about wearing it out than speed.

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