Skip site navigation (1)Skip section navigation (2)
Date:      Thu, 14 May 2015 10:16:03 -0453
From:      "William A. Mahaffey III" <wam@hiwaay.net>
Cc:        "FreeBSD Questions !!!!" <freebsd-questions@freebsd.org>
Subject:   Re: sysctl question
Message-ID:  <5554BABC.6080705@hiwaay.net>
In-Reply-To: <20150514105902.319e5f3f@gecko4>
References:  <55541052.6020802@hiwaay.net> <20150514055826.01e841ae@gecko4> <5554ABEF.4070300@hiwaay.net> <5554AD9D.9060201@hiwaay.net> <20150514105902.319e5f3f@gecko4>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
On 05/14/15 10:05, mfv wrote:
> On Thu, 14 May 2015 09:20:04 -0453
> "William A. Mahaffey III" <wam@hiwaay.net> wrote:
>
>> On 05/14/15 09:12, William A. Mahaffey III wrote:
>>> On 05/14/15 05:04, mfv wrote:
>>>> Hello William,
>>>>
>>>> I had the same problem using amdtemp but used the sysctl setting
>>>> "dev.amdtemp.%d.sensor_offset" to make it more accurate. The value
>>>> was determined by comparing the unadjusted value of admtemp with
>>>> the value shown in the BIOS.  In my case the setting
>>>> in /etc/sysctl.conf is:
>>>>
>>>>    dev.amdtemp.0.sensor_offset=24
>>>>
>>>> A room thermometer was also helpful to measure the difference by
>>>> comparing the difference between the room temperature and the BIOS
>>>> after the CPU was placed under load.
>>>>
>>>> To read the value I then bound the F2-key in csh.cshrc file as
>>>> follows:
>>>>
>>>>     bindkey -c "^[OQ" 'sysctl -e dev.amdtemp.0.core0'
>>>>
>>>> The results of the reading are not as accurate as I would like but
>>>> are an improvement.
>>>>
>>>>       Cheers ...                                 __o
>>>>                                                _ \<,_
>>>>       Marek                                   (+)/ (+)
>>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> P.S. Is there a way to set this on the fly, w/o a reboot ?
>>> TIA :-) ....
>>>
>>
>> [root@kabini1, /etc, 9:18:34am] 369 % sysctl
>> dev.amdtemp.0.sensor_offset=24 sysctl: unknown oid
>> 'dev.amdtemp.0.sensor_offset' [root@kabini1, /etc, 9:18:36am] 370 %
>> sysctl amdtemp.0.sensor_offset=24 sysctl: unknown oid
>> 'amdtemp.0.sensor_offset' [root@kabini1, /etc, 9:18:37am] 371 %
>> sysctl -A | grep -i amdtemp dev.amdtemp.0.%desc: AMD CPU On-Die
>> Thermal Sensors dev.amdtemp.0.%driver: amdtemp
>> dev.amdtemp.0.%parent: hostb5
>> dev.amdtemp.0.sensor0.core0: 10.0C
>> [root@kabini1, /etc, 9:18:41am] 372 % uname -a
>> FreeBSD kabini1.local 9.3-RELEASE-p13 FreeBSD 9.3-RELEASE-p13 #0: Tue
>> Apr  7 03:01:12 UTC 2015
>> root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
>> [wam@kabini1, ~, 9:19:39am] 399 %
>>
>>
> Yes, it is possible to do it on the fly:
>
> [10:55] ~ >
> dev.amdtemp.0.core0.sensor0=39.7C
>
> [10:55] ~ > sudo sysctl dev.amdtemp.0.sensor_offset=0
> dev.amdtemp.0.sensor_offset: 24 -> 0
>
> [10:55] ~ >
> dev.amdtemp.0.core0.sensor0=15.7C
>
> [10:55] ~ > sudo sysctl dev.amdtemp.0.sensor_offset=24
> dev.amdtemp.0.sensor_offset: 0 -> 24
>
> [10:55] ~ >
> dev.amdtemp.0.core0.sensor0=39.8C
>
> The 1st, 3rd and 5th command line are the results of the binding of the
> F2-key to the sysctl output.
>
> The 2nd command line sets the offset to the default of 0 while the
> 4th command line sets it back to 24 which is normally set in
> /etc/sysctl.conf.
>
> Your value will probably be different.
>
> Cheers ...
>
> Marek
> _______________________________________________
> freebsd-questions@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
>


When I tried as you did above as root (see farther above), it said 
'sysctl: unknown oid'. What version of FreeBSD are you using ? I'm on 
9.3R-p13, I suspect you might be on 10.1, & maybe that sysctl variable 
isn't available under 9.3R ....


-- 

	William A. Mahaffey III

  ----------------------------------------------------------------------

	"The M1 Garand is without doubt the finest implement of war
	 ever devised by man."
                            -- Gen. George S. Patton Jr.




Want to link to this message? Use this URL: <http://docs.FreeBSD.org/cgi/mid.cgi?5554BABC.6080705>