「Help」求助： 关于CPU frequency scaling的问题
发表于 ： 2018-02-09 18:49
Linux发行版：Xubuntu 14.04.5 LTS 64-bit
Linux内核：3.16.0-77-generic
CPU型号：Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
1）我把scaling_governor都调整为performance了
kashu:/tmp$ sudo cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
performance
performance
performance
performance
2）这是当前正在运行的CPU频率（2.9GHz)（一直在观察）
kashu:/tmp$ watch -n1 sudo cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq
2900000
2900000
2900000
2900000
我要运行一些比较耗费CPU资源的程序，CPU支持Intel® Turbo Boost Technology，我想让CPU一直在高频率上运行。
我的疑问：我设想这CPU应该在3.1GHz上运行的，为什么（scaling_governor）调整为performance后，CPU并没有在3.1GHz上运行，却基本保持在2.9GHz上运行着？是不是我的系统上/BIOS上还需要调整什么参数/选项才能让CPU稳定在3.1GHz上？
https://ark.intel.com/products/67355/In ... 0-GHz-rPGA
Processor Base Frequency: 2.50 GHz
Max Turbo Frequency: 3.10 GHz
Linux内核：3.16.0-77-generic
CPU型号：Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
1）我把scaling_governor都调整为performance了
kashu:/tmp$ sudo cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
performance
performance
performance
performance
代码： 全选
kashu:/tmp$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.10 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.96 GHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.10 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.90 GHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.10 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.94 GHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.10 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.90 GHz.
kashu:/tmp$ watch -n1 sudo cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq
2900000
2900000
2900000
2900000
我要运行一些比较耗费CPU资源的程序，CPU支持Intel® Turbo Boost Technology，我想让CPU一直在高频率上运行。
我的疑问：我设想这CPU应该在3.1GHz上运行的，为什么（scaling_governor）调整为performance后，CPU并没有在3.1GHz上运行，却基本保持在2.9GHz上运行着？是不是我的系统上/BIOS上还需要调整什么参数/选项才能让CPU稳定在3.1GHz上？
https://ark.intel.com/products/67355/In ... 0-GHz-rPGA
Processor Base Frequency: 2.50 GHz
Max Turbo Frequency: 3.10 GHz