How to: Get CPU temp

RedRep

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

Nice post! :)

Steve

ariyako

thanks! nice post!

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


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

@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

@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

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

Cino

@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

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

Steve

Cino

@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

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

@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

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

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

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

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

RedRep

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

asterix

Thank you !!

asterix

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

@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