Date: Tue, 7 Jul 1998 13:58:47 +0200 From: Thomas Zenker <thz@Lennartz-Electronic.DE> To: Andrzej Bialecki <abial@nask.pl> Cc: freebsd-current@FreeBSD.ORG Subject: Re: FreeBSD in less than 4MB RAM Message-ID: <19980707135847.61797@tue.le> In-Reply-To: <Pine.NEB.3.95.980707101327.20507D-100000@korin.warman.org.pl>; from Andrzej Bialecki on Tue, Jul 07, 1998 at 10:15:14AM %2B0200 References: <199807070702.AAA01156@rah.star-gate.com> <Pine.NEB.3.95.980707101327.20507D-100000@korin.warman.org.pl>
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On Tue, Jul 07, 1998 at 10:15:14AM +0200, Andrzej Bialecki wrote: > On Tue, 7 Jul 1998, Amancio Hasty wrote: > >> > > > First issue is: what would it take to squeeze any useful combination of >> > > > kernel, init plus two-three (small) user programs in 4MB? Which >> > > >> > > You don't want to run any inetd processes? As well as other such things >> > > which use memory. >> > >> >> I would start by first knowing how much memory is needed to run >> a kernel, init plus two or three (small) user programs with the >> current system. > >Not much - my experiments show it's somewhere around 6MB (if you start 2-3 >different programs, so that they can't share their pages). A couple of years back it was easily possible to have kernel and a couple of user processes in 4 MB. I had such a thing running with BSD/386 0.9 - 1.1, then they got fat. Up to V1.1 it was possible to have a kernel size of about 360K with the same "needed" functionality as we got later with a 800K V 2.0 kernel. The same with FBSD, I can not get a kernel smaller than about 800K now. Probably it would be possible to get a better modularity, but that's very difficult. For those which say "put in more memory/disk": This doesn't help if you have to run out of batteries w/ solar-panels on very remote localities, only access by radio-telemetry. You need very low power equipment there. So the question is not $ but watts. -- Thomas Zenker at work thz@lennartz-electronic.de private thz@tuebingen.netsurf.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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