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    SubjectRe: Unbloating the kernel, was: :mem=16MB laptop testing
    On Tuesday 14 October 2003 12:27 pm, Maciej Zenczykowski wrote:
    > > Let me concur with the sentiments on this thread.
    > >
    > > When I started using Linux, it was on a 40 MHz 386 with 8Megs of ram
    > > and a 200 Meg HD. This was a reasonably typical machine for the time
    > > (1993). I ran X on this machine, and it was fine running several
    > > Xterms and you could play the X version of Tetris or gnuchess. I
    > > used this machine to write the program I was working on for my
    > > Masters degree.
    > >
    > > Today, a machine with specs like I quoted above seems hopelessly
    > > slow. However, I was able to do useful work on it in 1993, and the
    > > same sort of work would still be useful today. You of course are not
    > > going to be able to run mozilla and KDE on it, but lynx, slrn, mutt,
    > > and fvwm will work fine. There are many people who will never be
    > > able to afford to buy a computer but could find someone to give them
    > > one of these "hopelessy outdated" machines for nothing. If we can
    > > ensure that Linux keeps working on these machines, it will be a good
    > > thing.
    > On one hand I agree with you - OTOH: why not run an older version of
    > the kernel? Are kernel versions 2.2 or even 2.0 really not sufficient
    > for such a situation? It should be noted that newer kernels are adding
    > a whole lot of drivers which aren't much use with old hardware anyway
    > and only a little actual non-driver related stuff (sure it's an
    > oversimplification, but...). Just like you don't expect to run the
    > latest
    > games/X/mozilla/kde/gnome on old hardware perhaps you shouldn't run the
    > latest kernel... perhaps you should...
    > Sure I would really like to be able to compile a 2.6 for my
    > firewall (486DX33+40MB-2MB badram) - but is this the way to go?
    Well... So far, 2.4 is enough for my routers. BUT, I also cannot put more
    than 32-40MB into them (i just don't have the budget to go buy 16MB FP or
    EDO DIMMs when I already have a bunch of 8MB DIMMs.

    I started my project running 2.2, but that wasn't enough for what I
    needed. It might have been fine for the most part, but iproute2 doesn't
    work completely on 2.2, and there's no IPTABLES. sure, ipchains is
    simpler to config by hand, but I still want to use iptables when I can
    for the increased flexibility.

    Simple fact. not everything can, or will, be backported. And not everybody
    can just make their own raw distribution. (tho it might have helped if i
    had used debian instead of RedHat on my router). and many modern distro
    installers don't like 32MB RAM... that's what i ran into.

    > As for making the kernel smaller - perhaps a solution would be to code
    > all strings as error codes and return ERROR#42345 or something instead
    > of the full messages - there seem to be quite a lot of them. I don't
    > mean to suggest this solution for all compilations but perhaps a switch
    > to remove strings and replace them with ints and then a seperately
    > generated file of errnum->string. I'd expect that between 10-15% of the
    > uncompressed kernel is currently pure text.

    Considered already. Was tied into i18n. was considered impractical, esp
    w/o a realtime LANANA services or equiv for error numbers.

    > Perhaps int->string conversion could be done by a loadable module or a
    > userspace program?
    > Just my 3c and some ideas.
    > Of course part of the problem is that by designing the kernel for high
    > mem situations we're using more memory hogging algorithms. It's a
    > simple matter of features vs mem footprint.
    > I'm not convinced either way - and I'm just posting this
    > as a voice in this discussion...
    > Cheers,
    > MaZe.
    Coward, n.:
    One who in a perilous emergency thinks with his legs.
    -- Ambrose Bierce, "The Devil's Dictionary"

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