Date: Mon, 03 Mar 2003 18:05:53 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Julian Elischer <julian@elischer.org> Cc: smp@freebsd.org Subject: RE: UP ans SMP on the same kernel Message-ID: <XFMail.20030303180553.jhb@FreeBSD.org> In-Reply-To: <Pine.BSF.4.21.0303031224510.42494-100000@InterJet.elischer.org>
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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. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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