问一下 r5 3900x 的 最低频率是不是 2200mhz

[morgan1freeman]

analyzing CPU 23: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 23 CPUs which need to have their frequency coordinated by software: 23 maximum transition latency: 4294.55 ms. hardware limits: 2.20 GHz - 4.67 GHz available frequency steps: 3.80 GHz, 2.80 GHz, 2.20 GHz available cpufreq governors: conservative, ondemand, userspace, powersave, performance, schedutil current policy: frequency should be within 2.20 GHz and 3.80 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 3.80 GHz (asserted by call to hardware). cpufreq stats: 3.80 GHz:16.73%, 2.80 GHz:4.52%, 2.20 GHz:78.75% (1114)

[nightwitch]

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

直接看数值

[s04]

https://www.amd.com/en/product/8436 Base Clock 3.8GHz

[greenskinmonster]

最低 550MHz ，用 amd-pstate

[morgan1freeman]

@greenskinmonster 多谢，已经用上了，之前 pve 待机太耗电了，所以想省点电，安装后确实能跑 550MHz 了，真的很好奇为啥，这个都进内核这么久了，还默认用 acpi_cpufreq ，估计 AMD 也压根没想兼容 ACPI

[morgan1freeman]

PVE 上 尝试了很多次，最终这个配置成功了， 修改 grub linux 默认启动参数 加上
initcall_blacklist=acpi_cpufreq_init amd_pstate.shared_mem=1 amd_pstate=passive

每次修改 boot 后记得 update-initramfs -k all -u && update-grub