Date: Sun, 27 May 2018 15:15:05 -0700 From: Maxim Sobolev <sobomax@freebsd.org> To: David Chisnall <theraven@freebsd.org> Cc: Mark Linimon <linimon@lonesome.com>, Matthew Macy <mat.macy@gmail.com>, Andrew Gallatin <gallatin@cs.duke.edu>, Pedro Giffuni <pfg@freebsd.org>, Cy Schubert <Cy.Schubert@cschubert.com>, Brooks Davis <brooks@freebsd.org>, Eugene Grosbein <eugen@grosbein.net>, Stefan Esser <se@freebsd.org>, "rgrimes@freebsd.org" <rgrimes@freebsd.org>, Gleb Smirnoff <glebius@freebsd.org>, Sean Bruno <sbruno@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: Deorbiting i386 Message-ID: <CAH7qZfuAorn8ha-p4hjUpfbz=jXWdPr8ONRXJAKCi9JjHV8jDQ@mail.gmail.com> In-Reply-To: <1A6567CD-5BE8-4E80-A262-00ADB75CF35A@FreeBSD.org> References: <201805232218.w4NMIxMA067892@slippy.cwsent.com> <e4311612-d1c4-b118-187b-7086945a312d@FreeBSD.org> <18a87d6d-14af-ef9d-80ff-403039e36692@cs.duke.edu> <CAPrugNomum%2BDO7M3GET3y0DrFse7jy1PmSUwnXGU5Sm6DXRrVg@mail.gmail.com> <20180525003949.GA710@lonesome.com> <CAH7qZfsbGheNqnwNmkP5jYiE=FXzc65yZSBoX_mM%2BuNce9rhyQ@mail.gmail.com> <05C5BD86-70D0-4B02-AC29-36E68B3602AE@FreeBSD.org> <CAH7qZfs6CGVjRK4jvRaVJ6aDoanxgSmwjiS34zn7gFYNdhKYSg@mail.gmail.com> <1A6567CD-5BE8-4E80-A262-00ADB75CF35A@FreeBSD.org>
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Well, strip extra 32 bits, use slower memory and busses (extra decoding logic etc). Voila, you suddenly have platform that can run 99% of code in wild today with just few hundred mW of power. Try that with arm32, you would be surprised how many software is technically compiling and all that, but has some weird runtime issues with either byte order or unaligned memory accesses. Not even mention performance issues due to the lack of hand-crafted JITs. Throwing away all that wealth is like shooting yourself in a foot...with a bazooka. -Max On Sat, May 26, 2018, 12:58 AM David Chisnall <theraven@freebsd.org> wrote: > On 26 May 2018, at 00:41, Maxim Sobolev <sobomax@FreeBSD.org> wrote: > > > > If you've seen any of the atom bay trail systems in action you may > understand what I mean. You get full blown x64 system with four cores and > it takes only 2W of power. > > Which is pretty much my point - if you want a low-power x86 system for > embedded use, it=E2=80=99s going to be x86-64, not x86-32 (though hopeful= ly you=E2=80=99re > using a 32-bit ABI with it). > > David > >
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