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From: Gabriel <egabriel@...>
Subject: Hurd
Date: Thu Jan 25 10:48:02 2001
> A question -- could you give us a quick overview of the differences between HURD and
> the Linux kernel?  I'm curious about what new things HURD offers.

This deserves a longer answer and I will post one when I have a bigger block
of time, but a few observations:

The hardware support is still much worse than linux.  There isn't incentive to 
do too much there for the Hurd team yet (chicken and egg... need a dist before
anyone really cares, need drivers to make a dist interesting enough to care
about).  It supports a modest list of ethernet cards and scsi controllers, 
and with X can support whatever video cards X can, but it as of now has no
sound driver at all.

Things are funky because it is a microkernel.  For instance, there is a login server, which runs under the 'login' id.  You login at a prompt like

login> login myusername

This is different than the unix 'getty' stuff.

A great deal of commands you normally run (mount, ifconfig, etc...) are obviated by a new command, "settrans".  This is because ext2fs, cd9660, pf_inet, etc, i
are translator daemons, not just devices in the unix sense.  This "herd of
daemons" is what really makes this different from Linux.  The kernel is
very minimal.  These daemons do sort of what modules do under linux, though
the analogy isn't really appropriate.  One of the side effects of this
is that the daemons are proper programs.  You can run them with --help 
apart from settrans, and they will list their own options.  How often I 
wish I could do that with a module.

Another good thing about this is people can develop kernel version independent
modules; making the distribution of drivers a lot simpler.  Ironically, this
will probably encourage the distribution of binary drivers if Hurd does
catch on.

There are some things that don't work as of now.  Irritatingly, one of them is 
df.  Booting from CD is also a problem.  Both of these apparently stem from 
the way inodes are currently handled.  These aren't insurmountable, but it
doesn't look like a lot of process has been made.  It is currently x86 only
as far as I know.  The limited hardware support is reminiscent of the 
oldest versions of Linux.

BTW, I am not a Hurd developer; just a guy that installed it for kicks, so if
my information is not factual, please keep me honest.  I am enthusiastic about
this because the most recent debian builds are better than I think a lot of
people realize, and there is a lot of opportunity to shape the way it evolves,
and the Portage system sounds like the right way, the GNU way, to do it.


Re: Hurd
-- drobbins
Re: Re: Tom
-- drobbins
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Updated Jun 17, 2009

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