Date: Tue, 22 Jun 2004 18:05:44 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Julian Elischer <julian@elischer.org> Subject: Re: STI, HLT in acpi_cpu_idle_c1 Message-ID: <200406221805.44339.jhb@FreeBSD.org> In-Reply-To: <200406222134.i5MLYQ9O041828@apollo.backplane.com> References: <FE045D4D9F7AED4CBFF1B3B813C85337051D9018@mail.sandvine.com> <200406221708.32433.jhb@FreeBSD.org> <200406222134.i5MLYQ9O041828@apollo.backplane.com>
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On Tuesday 22 June 2004 05:34 pm, Matthew Dillon wrote: > :On Thursday 17 June 2004 07:33 pm, Matthew Dillon wrote: > :> It kinda sounds like ACPI has bokered the other cpus. I'm not sure > :> why one would even *want* to use ACPI to idle down Xeon's in an MP > :> system, actually :-) > : > :Power and heat savings. > : > :-- > :John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ > > All well and nice, but if you want power and heat savings you don't > purchase a big honking SMP box in the first place. > > This sounds like a disaster waiting to happen to me. ACPI barely works > on UP systems, there is no way I would ever trust it to properly HLT or > otherwise screw around with the cpu timing on an SMP system. HLT is > plenty good enough. IMHO this type of feature is not something that > should be turned on by default on SMP. Certain large CPU vendors disagree. http://www.theinquirer.net/?article=16739 -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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