Date: Tue, 18 Nov 2003 22:40:40 -0800 (PST) From: Nate Lawson <nate@root.org> To: Eric Anderson <anderson@centtech.com> Cc: current@freebsd.org Subject: Re: acpi_cpu_idle panic (Was: Re: kernel panic with todays source) Message-ID: <20031118223605.O66622@root.org> In-Reply-To: <3FBAF515.6070507@centtech.com> References: <20031116120622.O57495@root.org> <200311180346.22259@harrymail> <20031118095752.R64353@root.org> <200311182346.13704@harrymail> <3FBAC2DB.1080004@centtech.com> <20031118172757.S65940@root.org> <3FBAF515.6070507@centtech.com>
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On Tue, 18 Nov 2003, Eric Anderson wrote: > Nate Lawson wrote: > >cvsup to -current as of today would be a good first start. The code was > >committed Nov 15. Then boot with acpi enabled and post the output of > >sysctl hw.acpi.cpu. You can try different levels by doing sysctl > >hw.acpi.cpu.cx_lowest=x where x is 0...(number_supported_states - 1) > > > Thanks! I've rebuilt and am happy to say that nothing is hosed and I > booted successfully :) > > Here's my sysctl output: > $ sysctl hw.acpi.cpu > hw.acpi.cpu.max_speed: 8 > hw.acpi.cpu.current_speed: 4 > hw.acpi.cpu.performance_speed: 8 > hw.acpi.cpu.economy_speed: 4 You should run a benchmark with different values for hw.acpi.cpu.current_speed to be sure the throttling control still works ok. I left it mostly intact so you shouldn't see any problems but it's still good to test. As you change it, you should see dmesg output of "acpi_cpu0: set speed to xx%" > hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 C3/185 > hw.acpi.cpu.cx_lowest: 0 > hw.acpi.cpu.cx_history: 23589/0 0/0 0/0 0/0 > > I played with the different levels a bit, and can't tell much difference > in them. Let me know what else I can try to break with this. Just for > the info, I booted with a/c plugged in, but did the sysctl running on > battery. You should set hw.acpi.cpu.cx_lowest to 1 regularly and 2 or 3 if you're using battery. This will save on heat. I'd also be interested in if you'd set it to 3 while on battery and run a typical workload for an hour and then send me the result of sysctl hw.acpi.cpu. The cx_history value helps me know if my scheduler is accurate. > Eric Anderson Systems Administrator Centaur Technology Say hi to Tom Crispin for me. :) -Nate
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