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日記

CPU Frequency, HPET, CONFIG_HZ, and PREEMPT

このエントリーをはてなブックマークに追加
2010年02月01日

---------------------------------------------------------
spinor@spinor-laptop:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz
stepping : 6
cpu MHz : 1000.000

spinor@spinor-laptop:~$ cpufreq-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 0
hardware limits: 1000 MHz - 1.67 GHz
available frequency steps: 1.67 GHz, 1.33 GHz, 1000 MHz
available cpufreq governors: conservative, ondemand, userspace,
powersave, performance
current policy: frequency should be within 1000 MHz and 1.67 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1000 MHz.
cpufreq stats: 1.67 GHz:23.33%, 1.33 GHz:0.17%, 1000 MHz:76.50% (299)

spinor@spinor-laptop:/sys/devices/system/cpu/cpu0/cpufreq$ cat
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand

spinor@spinor-laptop:/sys/devices/system/cpu/cpu0/cpufreq$ grep 0 cpuinfo*
cpuinfo_cur_freq:1000000
cpuinfo_max_freq:1667000
cpuinfo_min_freq:1000000
cpuinfo_transition_latency:10000

http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Frequency_Scaling
---------------------------------------------------------
spinor@spinor-laptop:~$ cat
/sys/devices/system/clocksource/clocksource0/currentavailable_clocksource
hpet acpi_pm

spinor@spinor-laptop:~$ grep clock /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash clocksource=hpet"

spinor@spinor-laptop:~$ cat
/sys/devices/system/clocksource/clocksource0/current_clocksource
hpet
---------------------------------------------------------
spinor@spinor-laptop:~$ grep HZ /boot/config-2.6*
/boot/config-2.6.31-14-generic:CONFIG_NO_HZ=y
/boot/config-2.6.31-14-generic:CONFIG_HZ_100=y
/boot/config-2.6.31-14-generic:# CONFIG_HZ_250 is not set
/boot/config-2.6.31-14-generic:# CONFIG_HZ_300 is not set
/boot/config-2.6.31-14-generic:# CONFIG_HZ_1000 is not set
/boot/config-2.6.31-14-generic:CONFIG_HZ=100
/boot/config-2.6.31-14-generic:CONFIG_MACHZ_WDT=m
/boot/config-2.6.31-9-rt:CONFIG_HZ=1000
/boot/config-2.6.31-9-rt:# CONFIG_HZ_100 is not set
/boot/config-2.6.31-9-rt:CONFIG_HZ_1000=y
/boot/config-2.6.31-9-rt:# CONFIG_HZ_250 is not set
/boot/config-2.6.31-9-rt:# CONFIG_HZ_300 is not set
/boot/config-2.6.31-9-rt:CONFIG_MACHZ_WDT=m
/boot/config-2.6.31-9-rt:CONFIG_NO_HZ=y
---------------------------------------------------------
spinor@spinor-laptop:~$ grep PREEMPT /boot/config-2.6.*
/boot/config-2.6.31-14-generic:# CONFIG_PREEMPT_RCU is not set
/boot/config-2.6.31-14-generic:# CONFIG_PREEMPT_RCU_TRACE is not set
/boot/config-2.6.31-14-generic:CONFIG_PREEMPT_NOTIFIERS=y
/boot/config-2.6.31-14-generic:# CONFIG_PREEMPT_NONE is not set
/boot/config-2.6.31-14-generic:CONFIG_PREEMPT_VOLUNTARY=y
/boot/config-2.6.31-14-generic:# CONFIG_PREEMPT is not set
/boot/config-2.6.31-9-rt:# CONFIG_DEBUG_PREEMPT is not set
/boot/config-2.6.31-9-rt:CONFIG_PREEMPT=y
/boot/config-2.6.31-9-rt:# CONFIG_PREEMPT_DESKTOP is not set
/boot/config-2.6.31-9-rt:CONFIG_PREEMPT_HARDIRQS=y
/boot/config-2.6.31-9-rt:# CONFIG_PREEMPT_NONE is not set
/boot/config-2.6.31-9-rt:CONFIG_PREEMPT_NOTIFIERS=y
/boot/config-2.6.31-9-rt:CONFIG_PREEMPT_RCU=y
/boot/config-2.6.31-9-rt:# CONFIG_PREEMPT_RCU_TRACE is not set
/boot/config-2.6.31-9-rt:CONFIG_PREEMPT_RT=y
/boot/config-2.6.31-9-rt:CONFIG_PREEMPT_SOFTIRQS=y
/boot/config-2.6.31-9-rt:# CONFIG_PREEMPT_VOLUNTARY is not set
---------------------------------------------------------

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