Date: Thu, 14 Dec 2006 12:03:24 -0500 From: "Coleman Kane" <zombyfork@gmail.com> To: obrien@freebsd.org Cc: cvs-src@freebsd.org, Scott Long <scottl@samsco.org>, src-committers@freebsd.org, mjacob@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/amd64/conf GENERIC Message-ID: <346a80220612140903meecf42av7383632e8173525@mail.gmail.com> In-Reply-To: <20061214155517.GA21748@dragon.NUXI.org> References: <200612140357.kBE3vY0Q053458@repoman.freebsd.org> <4580CD6A.5090802@samsco.org> <20061213201031.T26658@ns1.feral.com> <4580D3BB.7060504@samsco.org> <20061213210116.P26879@ns1.feral.com> <4580DE4E.3080008@samsco.org> <20061214155517.GA21748@dragon.NUXI.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 12/14/06, David O'Brien <obrien@freebsd.org> wrote: > > On Wed, Dec 13, 2006 at 08:13:24PM -0800, mjacob@freebsd.org wrote: > > Secondly, I would *like* to have SMP on as a default in RELENG_6 for > > amd64, as it would avoid doing what I've done twice already- fresh > > sysinstall may or may not have installed an SMP kernel but going off and > > building GENERIC then lost me my SMP. It's sort a violation of POLA. > > Rather close what happened to me and what lead to the commit. > > > On Wed, Dec 13, 2006 at 10:17:02PM -0700, Scott Long wrote: > > mjacob@freebsd.org wrote: > > > Scott Long wrote: > > > > There wasn't a full switchover to SMP at 6.0 because an SMP kernel > > > > on a UP system incurs a measurable runtime overhead, and we wanted > > > > to present a system that showed the best of FreeBSD to people who > > > > wanted to run it > > Then why is sparc64's GENERIC kernel SMP in RELENG_6? > > > > > But David's point is that most AMD64 boxes *are* SMP, not UP. Is > > > that wrong? > > > > 1. There are plenty of single core Opterons and Athlon64 chips still > > in service. > > A few points: > > * FreeBSD is predominately a server OS, not home desktop OS. > > * Practically all single core Opteron's are used in multi-socket systems. > There are very, very few Opteron single socket, single core Opteron's in > service as there are only a very small handful of single socket 940-pin > motherboards. > > * Most Athlon64 single-core CPU's are run in 32-bit "i386" mode. > FreeBSD/i386 isn't the platform I (and presumably Matt) are talking > about. > > > Maybe AMD sells more SMP systems now than UP systems, but their prior > > sales of UP systems didn't magically disappear overnight. > > This is not an AMD-only situation. > > Intel has been selling dual-core processors since 18 April 2005, and now > sells quad-core processors. Also, Intel kept Long Model (i.e., EM64T) > to the server/workstation segment until its dual-core processors. For > instance, most Intel laptops cannot run FreeBSD/AMD64. > > -- > -- David (obrien@FreeBSD.org) > _______________________________________________ > cvs-src@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/cvs-src > To unsubscribe, send any mail to "cvs-src-unsubscribe@freebsd.org" > Just to let you know, there are still a significant number of amd64 single-core laptops that are still sold these days.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?346a80220612140903meecf42av7383632e8173525>