Date: Fri, 21 Nov 2003 23:45:41 +0100 (CET) From: Lukas Ertl <l.ertl@univie.ac.at> To: Nate Lawson <nate@root.org> Cc: current@freebsd.org Subject: Re: Updated acpi_cpu patch Message-ID: <20031121234105.G623@korben.in.tern> In-Reply-To: <20031121135507.H76145@root.org> References: <20031118094821.T64353@root.org> <20031118221008.U621@korben.in.tern> <20031118131708.C64933@root.org> <20031118223352.W634@korben.in.tern> <20031120125407.L414@pcle2.cc.univie.ac.at> <20031121135507.H76145@root.org>
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On Fri, 21 Nov 2003, Nate Lawson wrote: > > > On Tue, 18 Nov 2003, Lukas Ertl wrote: > > > > I'm gonna try some "buildkernelstones" with the different settings. If > > > > you have some special benchmarks in mind I'd be happy to run them. > > > > > > That's probably ok. It has a lot of IO. > > > > Now I've tried running make buildkernel and tarring /usr/src to a > > different location, with different setting for hw.acpi.cpu.cx_lowest. I > > couldn't see any real difference - neither in performance nor in heat > > emission. > > Well, heat emission will be high during benchmarks because the CPU is > rarely idle. My fan always comes on my laptop during buildworld. But the > difference is when it's mostly idle (checking email, web browsing). With > machdep.cpu_idle_hlt=0, the fan is always on even when the box is sitting > there. With cpu_idle_hlt=0 and cx_lowest=0 (C1), the fan goes off but the > box is still warm. With cx_lowest=2 (C3, 120 us transition time), the box > is very cool but some IO gets a little slower (serial port). But not > much. The problem is that the fan in this machine always kicks in after several minutes, and then stays on. This is very annoying. BTW, I'm having another ACPI question, do these figures here make sense? hw.acpi.thermal.tz0._PSV: 3627 hw.acpi.thermal.tz0._CRT: 3662 If I understood the ACPI spec correctly, _PSV is the temperature where passive cooling actions begin, and _CRT is the critical temp, where the OS should initiate a shutdown. First, _PSV seems to be way to high, and second, they are so close to each other. > Those are what is more interesting. Also, can you send me your sysctl > hw.acpi.cpu.cx_history after you've used it for a while with the maximum > cx_lowest setting? Ok, no problem. regards, le -- Lukas Ertl eMail: l.ertl@univie.ac.at UNIX Systemadministrator Tel.: (+43 1) 4277-14073 Vienna University Computer Center Fax.: (+43 1) 4277-9140 University of Vienna http://mailbox.univie.ac.at/~le/
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