Date: Mon, 3 Mar 2003 16:08:31 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: John Baldwin <jhb@FreeBSD.org> Cc: smp@freebsd.org Subject: RE: UP ans SMP on the same kernel Message-ID: <Pine.BSF.4.21.0303031606390.42494-100000@InterJet.elischer.org> In-Reply-To: <XFMail.20030303180553.jhb@FreeBSD.org>
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On Mon, 3 Mar 2003, John Baldwin wrote: > > On 03-Mar-2003 Julian Elischer wrote: > > > > > > How much work would it take to make a kernel that could run > > on both SMP and UP machines (and use the extra CPUs?) > > > > UP kernels can run on SMP hardware, so I guess that it's mainly finding > > a way of switching from using the PIC to using some APICS > > dynamically, when you find that you have SMP hardware. > > > > Incidently I have several UP machines that have APICs > > and it may be effective to be able to run an APIC > > kernel on this hardware.. > > > > (This all assumes that the rest of the kernel was compiled > > SMP to have all the lockeng etc.) > > I am working on this, but it's taking a while amongst other > distractions. The real work is in the PIC vs. APIC stuff. > The actual SMP part is fairly easy as the sparc64, alpha, and > ia64 ports demonstrate. That's good to know.. We have spent a lot of effort making one "universal" kernel for our systems in the field, but now that we have some SMP machines, suddenly we have 2 again. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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