Date: Thu, 14 May 2015 10:59:02 -0400 From: mfv <mfv@bway.net> To: "William A. Mahaffey III" <wam@hiwaay.net> Cc: "FreeBSD Questions !!!!" <freebsd-questions@freebsd.org> Subject: Re: sysctl question Message-ID: <20150514105902.319e5f3f@gecko4> In-Reply-To: <5554AD9D.9060201@hiwaay.net> References: <55541052.6020802@hiwaay.net> <20150514055826.01e841ae@gecko4> <5554ABEF.4070300@hiwaay.net> <5554AD9D.9060201@hiwaay.net>
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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
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