Date: Wed, 7 Mar 2001 10:23:06 +0100 (CET) From: "Hartmann, O." <ohartman@klima.physik.uni-mainz.de> To: Kris Kennaway <kris@obsecurity.org> Cc: Antony T Curtis <antony@abacus.co.uk>, <freebsd-stable@FreeBSD.ORG> Subject: Re: ARCH flag in new make.conf Message-ID: <Pine.BSF.4.33.0103071022560.17134-100000@klima.physik.uni-mainz.de> In-Reply-To: <20010307011446.A8574@mollari.cthul.hu>
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On Wed, 7 Mar 2001, Kris Kennaway wrote: Is this also true for SMP systems? :>On Wed, Mar 07, 2001 at 09:09:36AM +0000, Antony T Curtis wrote: :>> Kris Kennaway wrote: :>> > :>> > On Wed, Mar 07, 2001 at 09:30:33AM +0100, Hartmann, O. wrote: :>> > > Dear Sirs. :>> > > :>> > > I'm really confused and surprised by the fact, that with the upcoming new :>> > > FreeBSD 4.3 in its make.conf we can choose architectural parameters for the :>> > > CPU architecture. And I will tell you why. :>> :>> <snip> :>> :>> > I've been running NIS on FreeBSD with world and kernel compiled with :>> > -march=pentiumpro for about 9 months with no ill effects. In fact :>> > I've never heard of reports of bad code generation using the -march :>> > settings -- it appears to be very stable. Are you sure you didn't :>> > have a nonstandard optimization setting (-O2, etc) as well? :>> :>> I have world compiled with -O2 with no ill effect (that I have noticed) :>> but if I compile the kernel with -O2, it looks okay but has problems :>> with talking TCP/IP - seems to generate faulty checksums and some other :>> quirks.... To put it simply, stable kernels are only with -O (in my :>> experience) :>> :>> (however, I have compiled KLDs with -O2 with no ill effect) :> :>Yes, this is well known (and documented in /etc/make.conf). I've :>*never* heard failure reports associated with using an -march option, :>nor seen any myself (all my systems run with -march=<whatever> and :>have never shown failures; contrasted with -O2 which inevitably causes :>problems each time I'm tempted to try it) :> :>I think Jordan's commit to /etc/make.conf warning people off of using :>CPUTYPE was premature. :> :>Kris :> -- MfG O. Hartmann ohartman@klima.physik.uni-mainz.de ---------------------------------------------------------------- IT-Administration des Institut fuer Physik der Atmosphaere (IPA) ---------------------------------------------------------------- Johannes Gutenberg Universitaet Mainz Becherweg 21 55099 Mainz Tel: +496131/3924662 (Maschinensaal) Tel: +496131/3924144 FAX: +496131/3923532 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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