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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.mel.connect.com.au!news.syd.connect.com.au!phaedrus.kralizec.net.au!news.mel.aone.net.au!grumpy.fl.net.au!news.webspan.net!newsfeeds.sol.net!news-xfer.netaxs.com!cam-news-hub1.bbnplanet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.itjit.ad.jp!news.ipro.ad.jp!ask.or.jp!news5-tokyonet!tokyonet.ad.jp!wnoc-tyo-news!aist-nara!odins-suita !nuis!news.cc.nagoya-u.ac.jp!marble!kato From: kato@eclogite.eps.nagoya-u.ac.jp (KATO Takenori) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Cyrix P166+ CPU patch - is it available? Date: 28 Jan 1997 17:23:29 GMT Organization: Nagoya University Computation Center Lines: 22 Message-ID: <5clcmh$g01@news.cc.nagoya-u.ac.jp> References: <5bmvnp$5dj@hermes.acs.unt.edu> NNTP-Posting-Host: marble.eps.nagoya-u.ac.jp Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Newsreader: mnews [version 1.20] 1996-12/08(Sun) Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:34680 In article <5bmvnp$5dj@hermes.acs.unt.edu> jackson@replicant.csci.unt.edu (Bruce Jackson) wrote: > For the jobs I run there is little floating point math. For me a > Cyrix CPU was both cheaper and faster than a Pentium. Under FreeBSD > it does probe as a '486 but it still performs great. I built a kernel > that would identify the CPU as a Pentium class CPU but it crashed > while booting with a supervisor violation. Perhaps in the future > FreeBSD will better support the 6x86 CPU's but for the time being it > does seem like a good choice to me. Cyrix 6x86 is a 486-class CPU. It supports the 486 instruction set, but it doesn't support the Pentium extensions for virtual mode, internal counters and additional debug capability. If the variable cpu_class is Pentium, kernel executes wrmsr and rdtsc instructions, which is not supported, then crash. ---- KATO Takenori <kato@eclogite.eps.nagoya-u.ac.jp> Dept. Earth Planet. Sci., Nagoya Univ., Nagoya, 464-01, Japan