Date: Mon, 05 Aug 2013 01:30:03 +0100 From: Frank Leonhardt <frank2@fjl.co.uk> To: freebsd-questions@freebsd.org Subject: Re: AMD Phenom II X4 temperature issues (was Re: hardware monitor) Message-ID: <51FEF20B.2090503@fjl.co.uk> In-Reply-To: <51FEE3E0.5080709@blackfoot.net> References: <51FEBE38.2000202@blackfoot.net> <20130804231548.dbb1fd2e.freebsd@edvax.de> <51FEE23D.3020402@blackfoot.net> <51FEE3E0.5080709@blackfoot.net>
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On 05/08/2013 00:29, Gary Aitken wrote: > On 08/04/13 17:22, Gary Aitken wrote: >> Ok, so now I see that my cpu temperature shoots up pretty dang fast when a >> build is going on. >> >> I'm running an AMD Phenom II X4 with the AMD-supplied fan in an >> ASUS M4A89TD PRO / USB3 motherboard. >> >> The system "works fine" unless I start a cpu-intensive build. >> If I leave it unattended, after some time the system shuts down abruptly. >> I'm guessing it's because of excessive cpu temperatures. >> >> When doing port builds, or any cpu-intensive job, the temperature of the >> CPU goes from 45 to 50 in about 30 seconds. >> >> I pretty much have to manually suspend and resume the build process >> to keep it down. If I do that, I avoid the abrupt shutdown. >> >> Needless to say, this makes unattended operation a non-starter... >> >> Does anyone else have a similar setup they can provide me some related >> experience on? > BTW, the mobo temp stays down around 32. > Did you get that from the ACPI? Obvious answers are a bigger fan, but a lot of home-build machines don't match the airflow through the case properly - if the CPU fan is blowing pre-warmed air on to the CPU it's not as good as blowing outside air. 50C isn't crazy. Some would say that was barely warm, in fact. Cooler is always better, but you possibly don't need to worry about this. Some CPUs use what they call passive temperature management, and power management, which means they increase or reduce the clock rate depending on the workload and whether it's getting too hot. Faster switching means more heat. So getting hotter when doing a lot of work makes sense and could be expected. (Winchesters really heat up like you wouldn't believe when you move the heads a lot). Did you get anywhere with the ACPI suggestion (you emailed me privately, whether you meant to or not, but didn't mention the outcome). There's a lot there in the ACPI you might want to look in to, including fan control. If I understand it correctly, "passive cooling" will be engaged by acpi_thermal if the cpufreq drivers are in use, which may not be what you want. Try hw.acpi.thermal.tz0.active=1 to make the fan come on and stay on (tz0 or as appropriate). Here's the fun part. Is your system doing a thermal overload shutdown? it will say so on the console, or in the message log. You didn't say, you just said it "shut down". If it's deciding to shut down through over-temperature it does not necesarily mean it's overheating; it could be that it has incorrectly set the shutdown temperatue for your CPU to be far too low - possibly because it doesn't recognise it and is being over-cautious. it might help if you posted the results of "sysctl hw.acpi.thermal", but in the mean time look at: hw.acpi.thermal.tz0._HOT hw.acpi.thermal.tz0._CRT (replace tz0 with whatever tz you're worried about). The first is the temperature when the system is supposed to stop what it's doing and suspend to disk (if it can). When it reaches the value on _CRT it'll write a message to the log file and shut down immediately to prevent damage. You can set these to whatever you want, but you have to set hw.acpi.thermal.user_override to 1 first before it will let you. Final trick - make sure you specify the temperatures like sysctl hw.acpi.thermal.tz0._CRT=80C Don't specify it as 80.0C (as it will display) and don't forget the C or it will assume degrees Kelvin! Regards, Frank.
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