Date: Thu, 02 May 2002 09:58:06 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: John Baldwin <jhb@FreeBSD.org> Cc: Jonathan Mini <mini@freebsd.org>, freebsd-smp@FreeBSD.ORG, Andrew Gallatin <gallatin@cs.duke.edu> Subject: Re: hlt when idle? Message-ID: <3CD1701E.7F0F4CB4@mindspring.com> References: <XFMail.20020502101631.jhb@FreeBSD.org>
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John Baldwin wrote: > >> So each CPU gets (1/num_cpu) * hz clock interrupts/sec? > > > > Yes, but because the timer is set to num_cpu*hz, each CPU ends up getting > > the normal hz interrupts. That's why it runs round-robin but looks like a > > broadcast. > > Eh, are you talking about the Alpha? On x86 we don't do this and have to use > IPI's to simulate a broadcast-type deal. You can get real broadcast behaviour *IF* the clock interrupt comes directly into the APIC, instead of being cascaded through the ISA PIC. That's kind of the whole point: some motherboards do, some motherboards don't. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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