For the OS to control cpu scaling, change the BIOS setting under Power Regulator to "OS Control". You should then see the "cpufreq" directory created under cpuN in sysfs. - naga - >-----Original Message----- >From: cpufreq-owner@xxxxxxxxxxxxxxx >[mailto:cpufreq-owner@xxxxxxxxxxxxxxx] On Behalf Of Stephen Carr >Sent: Wednesday, December 23, 2009 8:52 PM >To: cpufreq@xxxxxxxxxxxxxxx >Subject: Cpu frequency scaling DL360 G5 Dual Xeon > >Dear List > >I am try tot enable cpu scaling on a dual Xeon E5540 with all coes >active (8) and hyperthreading giving a total of 16 cores. > >Kernel is 2.6.32.2 base on Slackware 13 64 bit. > >It seems the problem is in the sysfs structure which is > >ls -l /sys/devices/system/cpu/ > >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu0/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu1/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu10/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu11/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu12/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu13/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu14/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu15/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu2/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu3/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu4/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu5/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu6/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu7/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu8/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpu9/ >drwxr-xr-x 2 root root 0 2009-12-24 13:04 cpufreq/ >drwxr-xr-x 2 root root 0 2009-12-24 13:04 cpuidle/ >-r--r--r-- 1 root root 4096 2009-12-24 13:04 kernel_max >-r--r--r-- 1 root root 4096 2009-12-24 13:04 offline >-r--r--r-- 1 root root 4096 2009-12-24 13:04 online >drwxr-xr-x 2 root root 0 2009-12-24 13:04 perf_events/ >-r--r--r-- 1 root root 4096 2009-12-24 13:04 possible >-r--r--r-- 1 root root 4096 2009-12-24 13:04 present >-rw-r--r-- 1 root root 4096 2009-12-24 13:04 sched_mc_power_savings >-rw-r--r-- 1 root root 4096 2009-12-24 13:04 sched_smt_power_savings > >Note cpufreq is not below cpuN (n=0-15) > >For cpu0 it is similar for all others > >ls -l /sys/devices/system/cpu/cpu0 > >drwxr-xr-x 6 root root 0 2009-12-24 13:04 cache/ >drwxr-xr-x 6 root root 0 2009-12-24 23:18 cpuidle/ >drwxr-xr-x 2 root root 0 2009-12-24 13:04 thermal_throttle/ >drwxr-xr-x 2 root root 0 2009-12-24 13:04 topology/ > >With debug set to cpufreq.debug=7 > >The the output in /var/log/debug is attached cpu_debug.txt > >It seems nothing can be initialised. > >Also there is no ACPI throttle messages in dmesg aka /var/log/messages > >The BIOS seems to have CPU scaling enabled ie dynamic power. > >Any ideas? > >On my Thinkpad the sysfs structure similar kernel also based on 64 bit >Slackware 13 kernel 2.6.31.6 CPU Intel(R) Core(TM)2 Duo CPU T5450 @ >1.66GHz > >ls -l /sys/devices/system/cpu > >drwxr-xr-x 7 root root 0 2009-12-24 06:56 cpu0/ >drwxr-xr-x 7 root root 0 2009-12-24 12:09 cpu1/ >drwxr-xr-x 2 root root 0 2009-12-24 12:09 cpuidle/ >-r--r--r-- 1 root root 4096 2009-12-24 12:09 kernel_max >-r--r--r-- 1 root root 4096 2009-12-24 12:09 offline >-r--r--r-- 1 root root 4096 2009-12-24 12:09 online >drwxr-xr-x 2 root root 0 2009-12-24 12:09 perf_counters/ >-r--r--r-- 1 root root 4096 2009-12-24 12:09 possible >-r--r--r-- 1 root root 4096 2009-12-24 12:09 present > > >ls -l /sys/devices/system/cpu/cpu0/ > >drwxr-xr-x 7 root root 0 2009-12-24 06:56 ./ >drwxr-xr-x 6 root root 0 2009-12-24 06:56 ../ >drwxr-xr-x 5 root root 0 2009-12-24 12:09 cache/ >drwxr-xr-x 3 root root 0 2009-12-24 06:56 cpufreq/ >drwxr-xr-x 6 root root 0 2009-12-24 12:09 cpuidle/ >drwxr-xr-x 2 root root 0 2009-12-24 12:09 thermal_throttle/ >drwxr-xr-x 2 root root 0 2009-12-24 12:09 topology/ > >Thanks >Stephen Carr >-- >Stephen Carr >School of Civil, Environmental & Mining Engineering >The University of Adelaide >Adelaide, South Australia, 5005 >Australia >Tel +618-8303-4313 >Fax +618-8303-4359 > >Email sgcarr@xxxxxxxxxxxxxxxxxxxxxx > >CRICOS Provider Number 00123M >----------------------------------------------------------- >This email message is intended only for the addressee(s) and >contains information that may be confidential and/or copyright. >If you are not the intended recipient please notify the sender >by reply email and immediately delete this email. Use, disclosure >or reproduction of this email by anyone other than the intended >recipient(s) is strictly prohibited. No representation is made >that this email or any attachments are free of viruses. Virus >scanning is recommended and is the responsibility of the recipient. > >-- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
