Date: Tue, 22 Jun 1999 11:17:56 -0400 (EDT) From: "Brian F. Feldman" <green@unixhelp.org> To: Kris Kennaway <kkennawa@physics.adelaide.edu.au> Cc: hackers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern imgact_gzip.c Message-ID: <Pine.BSF.4.10.9906221116250.59616-100000@janus.syracuse.net> In-Reply-To: <Pine.OSF.4.10.9906230009410.32101-100000@bragg>
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On Wed, 23 Jun 1999, Kris Kennaway wrote:
> On Tue, 22 Jun 1999, Brian F. Feldman wrote:
>
> > > Hmm..I don't have a deflate on my system. This should be linked static as
> > > well, otherwise you need the runtime linker + libraries, and that has a 69k
> > > overhead (when stripped). Possibly this could be optimized further..I don't
> > > know if this is small enough to be useful however.
> >
> > It's a proof of concept, it didn't need to be static. I don't have a program
> > to do deflate either. What I know is that you said it would be hard, but
> > it was not very hard to make a framework to do what gzexe does in C.
>
> Actually:
>
> > > > > The question is whether that would be easier than fixing the
> > > > > kernel to handle gzipped ELF binaries transparently -
> > > > > almost certainly it would be.
>
> I said it would be easy(ier) :)
>
> FWIW, compiling libc.a and libz.a with -Os brings the overhead down to 67416
> bytes per executable. Linked dynamically it's 4829 bytes (i.e. the other 62k
> is library code), so it doesn't look like there's much room for improvement.
This sure seems like enough to replace a.out gzip support. Taking the
compression/decompression routines out of the kernel would save memory and
result in roughly the same amount of space being used. If we had a deflate
program, this would work quite well =)
>
> Kris
>
> -----
> "Never criticize anybody until you have walked a mile in their shoes,
> because by that time you will be a mile away and have their shoes."
> -- Unknown
>
>
>
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