How much of microkernel?
dillon at apollo.backplane.com
Tue Aug 22 10:00:07 PDT 2006
:I've always been a fan of microkernel design and I would like to know
:how much towards microkernel design do you have plans to go with
:DragonFly? I know you will be incorporating VFS into userland which is
:normally a feature of a microkernel, but where do you wanna go after
:that, in regards to microkernelizing DragonFly? Drivers? TCP/IP? other
:Cheers and good luck programming! :)
Well, DragonFly is definitely not a microkernel. We forked off of
FreeBSD, after all, and that is a fairly monolithic kernel. I like
the microkernel concept but putting core elements of an operating
system into their own protection boxes result in fairly significant
That said, in order to reach our clustering goals we will have to
be able to operate most major kernel operations, such as devices and
filesystems, over a communications protocol as well as natively. This
infrastructure will make it possible to implement devices and filesystems
as user processes and thus become more microkernel-like.
Personally I think that non-performance-oriented devices really should
be run from their own sandboxes. There is no real need to have
msdosfs built into the kernel, for example. But devices for which
performance is important probably ought to stay in the kernel.
<dillon at xxxxxxxxxxxxx>
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