Hendrik,
Could anybody explain why Fiasco is so big in comparison with Minix 3? From the difference in size I would expect that there is an essential difference in the feature set between Minix 3 and Fiasco. Or are the Minix lines just four times longer on average?
I recollect from a talk that Jorrit Herder gave about that Minix3 does not support paged memory: it uses segments for enforcing protection, which explains a large part of the difference you observe.
Neal