DragonFly BSD
DragonFly kernel List (threaded) for 2003-10
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Re: Microkernel architecture?

From: Gary Thorpe <gathorpe79@xxxxxxxxx>
Date: Wed, 08 Oct 2003 01:22:41 -0400

Yeah, an exokernel sounds cool...until you realize that every single application needs to be linked into libraries that implement an OS basically. What does that do for memory usage? How protected is the machine from malicious/errant applications? Security? IPC?

A microkernel makes it possible to modularize the OS, but an exokernel sounds like it forces all the applications to be monolithic OS+app hybrids. The speed comparisons on the ExOS web site don't even use a particularly fast web server for BSD (or is NCSA now considered high performance as well as obsolete?).

Pedro Giffuni wrote:

This is off topic, (but just for reference and because there is not
technical-chat list ...)

when you mentioned you wanted a userland VFS API, I recalled someone already did
that: in fact, they turned everything into libraries and made the kernel very
small... they called it an Exokernel:


They invented softupdates, BTW :).

I believe Sun funding some research into improving FFS and the resultant code first emerged on BSD:

No mention of exokernels...was it used for the development?



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