硬件频率步长 - Intel P-State 与 ACPI CPUFREQ

Question

我已经用 kernelIntel Xeon Phi 7210运行了。我正在比较启动系统时可用的频率步骤与系统使用时可用的频率步骤。我跑去获取以下两个日志。CentOS 73.10.0-514.el7.x86_64intel p-stateacpi cpufreqsudo cpupower frequency-info

英特尔 P 状态

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: 1000 MHz - 1.50 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 1.40 GHz and 1.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency: 1.30 GHz (asserted by call to hardware)
  boost state support:
    Supported: yes
    Active: yes

ACPI CPU频率

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: 1000 MHz - 1.30 GHz
  available frequency steps:  1.30 GHz, 1.30 GHz, 1.20 GHz, 1.10 GHz, 1000 MHz
  available cpufreq governors: conservative userspace powersave ondemand performance
  current policy: frequency should be within 1000 MHz and 1.30 GHz.
                  The governor "conservative" may decide which speed to use
                  within this range.
  current CPU frequency: 1000 MHz (asserted by call to hardware)
  boost state support:
    Supported: yes
    Active: yes

为什么两个不同的缩放驱动程序显示不同的硬件频率限制？对于intel p-state，我看到频率限制从1GHz到1.5GHz，另一方面acpi cpufreq显示1GHz到1.3GHz。

根据数据表，上述处理器可以在1.5GHz睿频加速下运行，这就是它不可用的原因吗acpi cpufreq？

出现这种情况有什么具体原因吗？

谢谢。