Ubuntu 设置

与开机项有关的参数设置在 /etc/default/grub，可以对其进行调整

cat /etc/default/grub

# If you change this file, run 'update-grub' afterwards to update

# /boot/grub/grub.cfg.

# For full documentation of the options in this file, see:

# info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0

GRUB_TIMEOUT_STYLE=hidden

GRUB_TIMEOUT=10

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs

# This works with Linux (no patch required) and with any kernel that obtains

# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)

#GRUB_TERMINAL=console

# The resolution used on graphical terminal

# note that you can use only modes which your graphic card supports via VBE

# you can see them in real GRUB with the command `vbeinfo'

#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries

#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start

#GRUB_INIT_TUNE="480 440 1"

然后找到 GRUB_CMDLINE_LINUX_DEFAULT 所在的那行，增加配置

processor.max_cstate=0

intel_idle.max_cstate=0

sudo vim /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash processor.max_cstate=0 intel_idle.max_cstate=0"

然后更新 grub

sudo update-grub

另外可以设置CPU的scale-governor

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

## 设置CPU模式, 分别根据CPU 0-n 的编号进行设置

echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor

echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor

echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor

systemctl disable ondemand

/etc/rc.local

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq

重启后即可实现超频。

sudo reboot now

使用命令

cpufreq-info 查看当前 CPU 运行

cpufreq-set 也可以进行单独设置

cpufreq-aperf 用于计算一段时间内的平均频率

sudo apt install cpufrequtils

## 查看当前运行

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: 4294.55 ms.

hardware limits: 800 MHz - 3.60 GHz

available cpufreq governors: performance, powersave

current policy: frequency should be within 800 MHz and 3.60 GHz.

The governor "performance" may decide which speed to use

within this range.

current CPU frequency is 1.52 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: 4294.55 ms.

hardware limits: 800 MHz - 3.60 GHz

available cpufreq governors: performance, powersave

current policy: frequency should be within 800 MHz and 3.60 GHz.

The governor "performance" may decide which speed to use

within this range.

current CPU frequency is 2.66 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: 4294.55 ms.

hardware limits: 800 MHz - 3.60 GHz

available cpufreq governors: performance, powersave

current policy: frequency should be within 800 MHz and 3.60 GHz.

The governor "performance" may decide which speed to use

within this range.

current CPU frequency is 960 MHz.

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: 4294.55 ms.

hardware limits: 800 MHz - 3.60 GHz

available cpufreq governors: performance, powersave

current policy: frequency should be within 800 MHz and 3.60 GHz.

The governor "performance" may decide which speed to use

within this range.

current CPU frequency is 1.05 GHz.