在英特尔酷睿i7-4600U处理器支持Turbo Boost技术。它的基本频率为2.10GHz,最大Turbo频率为3.30GHz。就是说
- 如果禁用Turbo Boost(在BIOS设置菜单中),则CPU始终在2.10GHz下工作。
- 启用Turbo Boost且仅其中一个内核正在工作时,CPU的最高工作频率为3.30GHz。
- 如果启用了Turbo Boost,并且所有内核都在工作,则CPU将在2.10GHz下工作。
获取当前频率
要确定Turbo Boost是否已激活以及当前频率是多少,可以使用cpupower frequency-info
。例如,对于启用了Turbo Boost的旧Intel Core i5-660,您将获得以下内容。
$ cpupower frequency-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 1.20 GHz - 3.47 GHz
available frequency steps: 3.47 GHz, 3.33 GHz, 2.53 GHz, 1.87 GHz, 1.20 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 1.20 GHz and 3.47 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.87 GHz.
cpufreq stats: 3.47 GHz:82,67%, 3.33 GHz:0,00%, 2.53 GHz:0,00%, 1.87 GHz:0,06%, 1.20 GHz:17,28% (3)
boost state support:
Supported: yes
Active: yes
25500 MHz max turbo 4 active cores
25500 MHz max turbo 3 active cores
25500 MHz max turbo 2 active cores
25500 MHz max turbo 1 active cores
请注意,该信息说明了硬件限制(1.20 GHz - 3.47 GHz
),可能的频率(3.47 GHz, 3.33 GHz, 2.53 GHz, 1.87 GHz, 1.20 GHz
)和当前频率(1.87 GHz
)。您可以在英特尔网站上找到这些频率的技术信息。
禁用TurboBoost时的频率
注意区别,当你运行采用Turbo Boost相同的命令禁止:在boost state support
一节中,值Supported
和Active
是no
。在此,CPU始终处于标称/最小值(1.20Ghz)。
$ cpupower frequency-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 1.20 GHz - 3.47 GHz
available frequency steps: 3.47 GHz, 3.33 GHz, 2.53 GHz, 1.87 GHz, 1.20 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 1.20 GHz and 3.47 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
cpufreq stats: 3.47 GHz:40,86%, 3.33 GHz:0,01%, 2.53 GHz:0,06%, 1.87 GHz:0,22%, 1.20 GHz:58,85% (493)
boost state support:
Supported: no
Active: no
25500 MHz max turbo 4 active cores
25500 MHz max turbo 3 active cores
25500 MHz max turbo 2 active cores
25500 MHz max turbo 1 active cores
您可以使用BIOS或某些Linux选项/命令来禁用Turbo Boost 。该内核支持可启用/使用禁用/sys/devices/system/cpu/cpufreq/boost
文件。
/proc/cpuinfo
还应该有一行显示cpu MHZ: ...
当前速度。之后的2.1@
是基本速度(无涡轮增压)。