Date: Mon, 17 Feb 2020 22:00:01 +0000 From: Steve O'Hara-Smith <steve@sohara.org> To: freebsd-questions@freebsd.org Subject: Re: Technological advantages over Linux Message-ID: <20200217220001.c87e2f2f844f7c45faf712a1@sohara.org> In-Reply-To: <44y2t1td8d.fsf@be-well.ilk.org> References: <20200214121620.GA80657@admin.sibptus.ru> <CAHieY7Ss0SftTD6S%2Bk2OkX-PinTwzEXGQwz1twmwZ5ZMndpc%2Bg@mail.gmail.com> <1848571509.3253011.1581719423989@mail.yahoo.com> <20200215195303.464e585a.freebsd@edvax.de> <20200215202033.6c856b8f7639b304d96e68ce@sohara.org> <20200215215825.5d3c9a1a@archlinux> <20200215211542.e8cc2827fc4664ea4bcad918@sohara.org> <20200215223449.355a9ac9@archlinux> <20200215223649.40196f37@archlinux> <20200215232623.7995b06e@archlinux> <20200215235822.f804ffc6.freebsd@edvax.de> <20200215232931.5a9132b2e83daa2d0a06dac8@sohara.org> <44y2t1td8d.fsf@be-well.ilk.org>
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On Mon, 17 Feb 2020 11:01:06 -0500 Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> wrote: > Steve O'Hara-Smith <steve@sohara.org> writes: > > > The late Morten Reistad used to post (in alt.folklore.computers) > > about the numbers of processors with memory management being made and > > comparing that with Windows licenses, Apple and Android phone production > > numbers. Windows, MacOs and commercial unix licenses only account for a > > small fraction of the CPUs made - most of them have to be running > > something else Linux (Android, routers, TVs, cars ...), BSD (routers > > and who knows what else) and Mach (iThingies) being the obvious > > available kernels. > > Back then, having memory management implied having virtual memory. These Back then was a couple of years ago. > days, some fairly low-end CPUs have MMUs. Furthermore, memory management Low end CPUs that are a lot more powerful than a PDP-11. > is very useful for implementing process privileges, even on an OS that > does not use virtual memory; again, something that wasn't relevant back > in the ay. Having an MMU is a pre-requisite for running a multi-user OS, that was why he picked that feature. -- Steve O'Hara-Smith | Directable Mirror Arrays C:\>WIN | A better way to focus the sun The computer obeys and wins. | licences available see You lose and Bill collects. | http://www.sohara.org/
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