Date: Mon, 17 Oct 2005 18:50:38 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, Eric Anholt <eta@lclark.edu>, cvs-all@FreeBSD.org, Gleb Smirnoff <glebius@FreeBSD.org>, David O'Brien <obrien@FreeBSD.org> Subject: Re: cvs commit: src/sys/amd64/amd64 identcpu.c src/sys/i386/i386 identcpu.c Message-ID: <200510171850.39961.jkim@FreeBSD.org> In-Reply-To: <20051017220004.GI15097@odin.ac.hmc.edu> References: <200510160858.j9G8wR9v045670@repoman.freebsd.org> <20051017213635.GC59364@cell.sick.ru> <20051017220004.GI15097@odin.ac.hmc.edu>
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On Monday 17 October 2005 06:00 pm, Brooks Davis wrote: > On Tue, Oct 18, 2005 at 01:36:35AM +0400, Gleb Smirnoff wrote: > > David, > > > > On Mon, Oct 17, 2005 at 12:20:18PM -0700, David O'Brien wrote: > > D> Other than my electric company no one (people or > > D> FreeBSD SW) should care that I have dual-core CPU's. > > > > I don't agree. The dmesg output should describe the physical > > layout of the hardware, too. When maintaining hundreds of systems > > in server room, people usually forget what lives inside the > > computer cases. And when one needs to tell what is the > > motherboard and how many sockets and fans it has, he should be > > capable to do this without opening the case. > > I'm not sure that I care what dmesg says, but I do want an accurate > view of our topology presented by the system, not some arbitrary > and frankly meaningless CPU count. If nothing else I care because > the two cores share one memory controller. That may not be all > that noticable now for normal application, but I expect it will be > once we start seeing 4+ core CPUs. Telling the user the (somewhat > complicated) truth about their hardware is part of "doing it > right". I believe we have to implement ACPI SRAT (Static Resource Affinity Table) and SLIT (System Locality Information Table) to achieve this. Linux already does this for i386, amd64, and i64: http://lxr.linux.no/source/arch/i386/kernel/srat.c http://lxr.linux.no/source/arch/x86_64/mm/srat.c http://lxr.linux.no/source/arch/ia64/kernel/acpi.c Jung-uk Kim
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