Date: Tue, 22 Aug 1995 09:31:21 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: bde@zeta.org.au (Bruce Evans) Cc: roberto@keltia.frmug.fr.net, terry@cs.weber.edu, freebsd-hackers@FreeBSD.org Subject: Re: Install issues (was: State of the union speech Message-ID: <199508220001.JAA25059@genesis.atrad.adelaide.edu.au> In-Reply-To: <199508211747.DAA03262@godzilla.zeta.org.au> from "Bruce Evans" at Aug 22, 95 03:47:25 am
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Bruce Evans stands accused of saying: > > >I'm sure you're aware Linux has this scheme for at least a year, called > >UMSDOS, made by a French guy... > > UMSDOS is apparently a mixed blessing. It is much slower than ext2fs, and > people tend to keep using it and wonder why Linux is so slow. > > We could do demos using a big file mapped by the vn driver to a virtual > disk containing slices and partitions, but the file systems would be > very slow (even if the DOS file is contiguous, msdosfs doesn't support > clustering so it would do i/o's in too-small sizes). Oddly, I haven't had any bites on my last post about this, so I'll ask again : I have code that creates a large contiguous slab of sectors in an MSDOS filesystem, and hides them under a file. I've explored what I can of the diskslice code and the like, but I'm at a loss as to how to redirect a slice to point at this slab, short of rewriting the partition table (which would be Bad) or writing a variant on the vnode driver (which would defeat the whole purpose). This is basically a ready-to-go partition, it just needs water, so to speak. > Bruce -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] My car has "demand start" -Terry Lambert UNIX: live FreeBSD or die! [[
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