How to: Get CPU temp

RedRep · Aug 7, 2011, 9:44 PM

I've got pfSense running on an Intel Atom N270 and I was kinda worried about CPU temps because the CPU is passively cooled. I tried adding the mbmon package but it couldn't find any sensors to read.

[2.0-RC3][root@pfsense.ph.cox.net]/boot/kernel(48): mbmon
No Hardware Monitor found!!
InitMBInfo: Unknown error: 0
[2.0-RC3][root@pfsense.ph.cox.net]/boot/kernel(52): mbmon -A
InitMBInfo: Unknown error: 0
This program needs "setuid root"!!

Kinda bummed me out and through searching I couldn't really find a way to check temps. I noticed someone said you could just check the acpi stats for temp. Well, no go on my motherboard for that one too. I came across one post telling you to add coretemp_load="YES" to loader.conf so I went ahead and did that. No go, couldn't figure out why.

Well, after reading a post by jimp:

If you have a modern AMD or Intel chip, the amdtemp/coretemp modules help, but we don't build them on pfSense (grab them from a FreeBSD 8.1 install).

I went ahead and vboxed a FreeBSD 8.1 install and copied the coretemp.ko module to my pfsense RC2 box and ran kldload coretemp.
This popped up in my pfSense system log: :)

kernel: coretemp0: <cpu on-die="" thermal="" sensors="">on cpu0
kernel: coretemp1: <cpu on-die="" thermal="" sensors="">on cpu1</cpu></cpu>

Success.

[2.0-RC3][root@pfsense.ph.cox.net]/boot/kernel(53): sysctl -a | grep temperature
dev.cpu.0.temperature: 64.0C
dev.cpu.1.temperature: 64.0C

Hope this helps someone else.

EDIT:Thank you PTT for hosting the following files :)

Cliffnotes:

cd /boot/kernel
pkg_add -r wget
pkg_add -r unzip
rehash
wget http://ptt.4mg.com/pfSense/coretemp32.zip //if you are on i386
wget http://ptt.4mg.com/pfSense/coretemp64.zip //if you are on AMD64
unzip coretemp32.zip (or coretemp64.zip)
kldload coretemp
sysctl -a | grep temperature

If you would like to change the text to have a degree symbol:
1. Change line 240 in /usr/local/www/widgets/widgets/system_information.widget.php
from

" />

to

" />

Also, to help anyone else out that stumbled across this problem after they copied a coretemp.ko they either found on the internet or copied from an existing FreeBSD install.

[2.0-RC3][root@pfsense.ph.cox.net]/boot/kernel(29): ls | grep core
coretemp.ko
[2.0-RC3][root@pfsense.ph.cox.net]/boot/kernel(26): kldload coretemp
kldload: can't load coretemp: No such file or directory

or

kernel: KLD coretemp.ko: depends on kernel - not available or version mismatch

I came across this error because I tried to get someone in ##freebsd to send me their coretemp.ko file. Turns out that they were on FreeBSD 8.2 and the kernel module wasn't compatible with 8.1.

stephenw10 · Aug 4, 2011, 11:19 AM

Nice post! :)

Steve

ariyako · Aug 4, 2011, 1:06 PM

thanks! nice post!

GoldServe · Aug 4, 2011, 5:51 PM

How does one get this module loaded on every boot?

I found that the system information widget almost has temperature built in.

Edit the following files:

/usr/local/www/includes/functions.inc.php


function has_temp() {

	/* no known temp monitors available at present */

	/* should only reach here if there is no hardware monitor */
	return true;
}

function get_temp() {
	$temp_out = "";
	exec("/sbin/sysctl dev.cpu.0.temperature | /usr/bin/awk '{ print $2 }' | /usr/bin/cut -d 'C' -f 1", $dfout);
	$temp_out = trim($dfout[0]);

	return $temp_out;
}

stephenw10 · Aug 4, 2011, 5:57 PM

@GoldServe:

How does one get this module loaded on every boot?

Add the line:
coretemp_load="yes"

to /boot/loader.conf.local
Create the file if necessary. That file is copied across a firmware update, however the kernel module will not be (i think).

Steve

Edit: corrected syntax

RedRep · Aug 4, 2011, 7:15 PM

@GoldServe:

How does one get this module loaded on every boot?

I found that the system information widget almost has temperature built in.

Edit the following files:

/usr/local/www/includes/functions.inc.php

That's pretty cool! :)

asterix · Aug 4, 2011, 8:52 PM

Can we get this functionality added to future snapshots.. especially amd64 ?

Cino · Aug 4, 2011, 9:16 PM

@asterix I agree, this is nice little feature!! if yoru hardware supports it

@RedRep and i thought my box was hot at 52c

I noticed coretemp reads 52 but my IPMI sensor show 57… Who is correct? I wonder if the BIOS screen would read something different

but either case, its good to to have on the dash...

stephenw10 · Aug 4, 2011, 9:16 PM

There's surely some reason that isn't included already?
What happens if coretemp isn't loaded?

Steve

Cino · Aug 4, 2011, 9:18 PM

@stephenw10:

There's surely some reason that isn't included already?
What happens if coretemp isn't loaded?

Steve

let see, i ran kldunload coretemp then looked at the dash… its in the dash but only reads C

I loaded it up and it showed on the dash without refreshing the page :-)

stephenw10 · Aug 4, 2011, 9:33 PM

Right, so it needs some code to stop it showing "temperature C" if you don't have the right hardware/driver installed.

Steve

Edit: Should be °C if you ask me. ;)

RedRep · Aug 4, 2011, 9:56 PM

@stephenw10:

Right, so it needs some code to stop it showing "temperature C" if you don't have the right hardware/driver installed.

Steve

Edit: Should be °C if you ask me. ;)

There is a function in functions.inc.php for that; I will add that functionality tonight after work. I also grabbed the coretemp module for the amd release which I will upload somewhere as well. On an iPad right now though. :(

@Cino:

@RedRep and i thought my box was hot at 52c

It is completely fanless. :)

asterix · Aug 4, 2011, 11:08 PM

Eagerly waiting for the amd64 coretemp module !! ;D

Keeping myself ready for the change.. I am getting the below error.

[2.0-RC3][admin@pfsense.localdomain]/boot/kernel(5): pkg_add -r wget
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/amd64/packages-8.1-release/Latest/wget.tbz… Done.
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/amd64/packages-8.1-release/All/libiconv-1.13.1_1.tbz... Done.
Fetching ftp://ftp.freebsd.org/pub/FreeBSD/ports/amd64/packages-8.1-release/All/gettext-0.18_1.tbz... Done.
[2.0-RC3][admin@pfsense.localdomain]/boot/kernel(6): wget http://encodable.com/uploaddemo/files/pfsense/coretemp.ko
wget: Command not found.

Not sure why my wget command isin't working? Is this too 32/64 bit sensitive? I have amd64 installed.

Maybe "fetch" would work.. but not sure what would be the precise syntax for it to download the coretemp.ko file.

Edit:
Nevermind.. I used File Manager to upload the file for testing. Doesn't work..lol. Will wait for the amd64 version.

stephenw10 · Aug 5, 2011, 12:14 AM

You have to issue a rehash after you've added a package so Freebsd knows where to find it. Or reboot.

[2.0-RC3][root@pfsense.fire.box]/root(1): rehash

Steve

asterix · Aug 5, 2011, 2:22 AM

Aah I see. Thanks for the info. Not much of a FreeBSD user so learning every day.

Can't wait to try the amd64 coretemp.

GoldServe · Aug 5, 2011, 4:22 AM

My N270 is 52-55C in a totally passively cooled solution (Lanner netapp).

RedRep · Aug 5, 2011, 4:57 AM

http://encodable.com/uploaddemo/files/pfsense/coretemp.ko-amd64
AMD64 version

asterix · Aug 5, 2011, 5:40 AM

Thank you !!

asterix · Aug 5, 2011, 6:11 AM

It's working !!

[2.0-RC3][admin@pfsense.localdomain]/root(1): sysctl -a | grep temperature
dev.cpu.0.temperature: 59.0C
dev.cpu.1.temperature: 54.0C
dev.cpu.2.temperature: 57.0C
dev.cpu.3.temperature: 51.0C

Added to local.conf to auto load at boot.. yeehaa !!!

Now how do I make the temp show up at the main system information for all 4 cores?

Cino · Aug 5, 2011, 1:46 PM

@stephenw10:

Right, so it needs some code to stop it showing "temperature C" if you don't have the right hardware/driver installed.

Steve

Edit: Should be °C if you ask me. ;)

agreed…. I did try to add ° but it didn't like it.... Figure we need ANSI code or something for it to display in the widget