Date: Wed, 16 Mar 2011 21:40:33 -0700 From: Julian Elischer <julian@freebsd.org> To: Ivan Voras <ivoras@freebsd.org> Cc: Erik Trulsson <ertr1013@student.uu.se>, src-committers@freebsd.org, Roman Divacky <rdivacky@freebsd.org>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, Jung-uk Kim <jkim@freebsd.org> Subject: Re: svn commit: r219679 - head/sys/i386/include Message-ID: <4D8190C1.4090004@freebsd.org> In-Reply-To: <AANLkTin9qY0BMii57rhy-XF82J5XXfvQ-4tR0ra-EOB2@mail.gmail.com> References: <201103152145.p2FLjAlt060256@svn.freebsd.org> <20110316004503.GM99496@mdounin.ru> <201103161233.16347.jkim@FreeBSD.org> <20110316174553.GA6367@freebsd.org> <20110316200346.GA36431@owl.midgard.homeip.net> <AANLkTin9qY0BMii57rhy-XF82J5XXfvQ-4tR0ra-EOB2@mail.gmail.com>
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On 3/16/11 2:16 PM, Ivan Voras wrote: > On 16 March 2011 21:03, Erik Trulsson<ertr1013@student.uu.se> wrote: >> On Wed, Mar 16, 2011 at 06:45:53PM +0100, Roman Divacky wrote: >>> On Wed, Mar 16, 2011 at 12:32:56PM -0400, Jung-uk Kim wrote: >>>> On Tuesday 15 March 2011 08:45 pm, Maxim Dounin wrote: >>>>> This isn't really different as long as GENERIC kernel used, as >>>>> GENERIC defines I486_CPU. >>>> Fixed in r219698, sorry. >>>> >>>> Actually, I think we should remove i486 from GENERIC at some point. >>>> It has too many limitations. For example, I really love to implement >>>> atomic 64-bit mem read/write using cmpxchg8b (no 0xf00f joke, please) >>>> but I cannot do that cleanly without removing I486 support or >>>> checking cpu_class at run-time. :-( >>> if we drop i486 I think it makes sense to require something that has >>> at least SSE2, thus we can have the same expectations as on amd64. >> No, that would remove support from far too many machines that people >> actually use to run FreeBSD. >> There are probably only a handful of people (if that) who actually run >> FreeBSD on an actual 486-class machine, but requiring SSE2 would mean >> dropping support for Pentium-III and Athlon-XP equipped machines and >> I believe there are a large number of such machines still in use, and >> they are still perfectly suitable for a large number of tasks. > This is understandable but I also think it deserves a poll at stable@ > and current@. It might be worth keeping i486 for all of 9-stable but > removing it before 10-stable. Judging from previous releases, 9.x > would be supported until at least 2016. I don't follow the embedded > world that much, but from what I saw, most (incl. Soekris) are moving > to Atom designs which support SSE2. not sure what is in the Soekris and other embedded machines but do keep them in mind. many are now 586 class I guess but there may still be some 486 ones around. I believe you can now get a 486 core in some arrays. >
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