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Intel Turbo Boost 无法与“Powersave”CPU 调速器配合使用

tag-icon • tag-icon 18.04 power-management performance intel cpu
Intel Turbo Boost 无法与“Powersave”CPU 调速器配合使用

Intel Turbo Boost 不会因“Powersave”调节器而启动。

它确实在“性能”调节器上起作用，但即使 CPU 处于空闲状态，它也会将频率锁定在涡轮增压上。

“绩效”州长：

  • CPU 频率始终锁定在 Turbo Boost 模式 (3.2Ghz)。
  • 从而使 CPU 无缘无故地发热。

“Powersave” 州长：

  • CPU 频率在空闲时为 800Mhz，这是理想的，但在 100% 使用率时最高为 2.6Ghz。这意味着英特尔 Turbo Boost 从未激活。

我想要实现的目标：

我希望在使用“省电”调节器时 Intel Turbo Boost 能够启动，这样我就可以在空闲时获得低频率，并在接近 100% CPU 使用率时获得最大性能。我不想将调节器锁定为“性能”模式，因为我喜欢“省电”给我的空闲时的低频率。

细节：

  • 中央处理器：英特尔(R) 酷睿(TM) i7-6700HQ CPU @ 2.60GHz
  • Turbo Boost 最大频率：3.20GHz
  • 操作系统：Ubuntu 18.04.4 LTS
  • 核心：5.3.0-46-通用

使用“powersave”调节器进行压力测试时的频率信息：

[lucas:~/local/box] bfdd3ffb(+1/-1)* ± cpupower frequency-info
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:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 3.50 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 800 MHz and 3.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 2.90 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

并与“性能”调节器配合使用：

θ78° [lucas:~/local/box] bfdd3ffb(+1/-1)* ± cpupower frequency-info
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:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 3.50 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 800 MHz and 3.50 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 3.32 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

在这两种调速器下，涡轮增压都处于活动状态，并且min_perf_pct和max_perf_pct相同：

cat /sys/devices/system/cpu/intel_pstate/no_turbo
0
cat /sys/devices/system/cpu/intel_pstate/min_perf_pct
22
cat /sys/devices/system/cpu/intel_pstate/max_perf_pct
100

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