[知其然不知其所以然-19] acpi-idle 和 intel_idle

来源：互联网发布：php 模拟post发送数据编辑：程序博客网时间：2024/06/06 05:37

acpi-idle and intel_idle are two most common idle drivers for x86 platforms,

firstly I'm going to dig into acpi-idle a little bit more detail, then switch to

another easier driver, thus intel_idle.

For lastest intel platforms, the default idle driver is intel_idle, but we want

to do some research on acpi idle, so we append idle=nomwait in boot ops,

then we get these cpuidle datas on Surface Pro 3:

chenyu@chenyu-Surface-Pro-3:/$ cat /proc/cmdlineBOOT_IMAGE=/boot/vmlinuz-4.5.0-mainline-bat+ root=UUID=a7a5193b-8ecb-4025-b390-d728bcccf0a2 ro quiet splash vt.handoff=7 idle=nomwait

chenyu@chenyu-Surface-Pro-3:/$ cat /sys/devices/system/cpu/cpuidle/current_driveracpi_idle

chenyu@chenyu-Surface-Pro-3:/$ grep . /sys/devices/system/cpu/cpu3/cpuidle/state                                                                                        */*/sys/devices/system/cpu/cpu3/cpuidle/state0/desc:CPUIDLE CORE POLL IDLE/sys/devices/system/cpu/cpu3/cpuidle/state0/disable:0/sys/devices/system/cpu/cpu3/cpuidle/state0/latency:0/sys/devices/system/cpu/cpu3/cpuidle/state0/name:POLL/sys/devices/system/cpu/cpu3/cpuidle/state0/power:4294967295/sys/devices/system/cpu/cpu3/cpuidle/state0/residency:0/sys/devices/system/cpu/cpu3/cpuidle/state0/time:53206/sys/devices/system/cpu/cpu3/cpuidle/state0/usage:254/sys/devices/system/cpu/cpu3/cpuidle/state1/desc:ACPI HLT/sys/devices/system/cpu/cpu3/cpuidle/state1/disable:0/sys/devices/system/cpu/cpu3/cpuidle/state1/latency:1/sys/devices/system/cpu/cpu3/cpuidle/state1/name:C1/sys/devices/system/cpu/cpu3/cpuidle/state1/power:0/sys/devices/system/cpu/cpu3/cpuidle/state1/residency:2/sys/devices/system/cpu/cpu3/cpuidle/state1/time:2180897/sys/devices/system/cpu/cpu3/cpuidle/state1/usage:7235/sys/devices/system/cpu/cpu3/cpuidle/state2/desc:ACPI IOPORT 0x1816/sys/devices/system/cpu/cpu3/cpuidle/state2/disable:0/sys/devices/system/cpu/cpu3/cpuidle/state2/latency:148/sys/devices/system/cpu/cpu3/cpuidle/state2/name:C2/sys/devices/system/cpu/cpu3/cpuidle/state2/power:0/sys/devices/system/cpu/cpu3/cpuidle/state2/residency:296/sys/devices/system/cpu/cpu3/cpuidle/state2/time:1744509/sys/devices/system/cpu/cpu3/cpuidle/state2/usage:1463/sys/devices/system/cpu/cpu3/cpuidle/state3/desc:ACPI IOPORT 0x1819/sys/devices/system/cpu/cpu3/cpuidle/state3/disable:0/sys/devices/system/cpu/cpu3/cpuidle/state3/latency:506/sys/devices/system/cpu/cpu3/cpuidle/state3/name:C3/sys/devices/system/cpu/cpu3/cpuidle/state3/power:0/sys/devices/system/cpu/cpu3/cpuidle/state3/residency:1012/sys/devices/system/cpu/cpu3/cpuidle/state3/time:364230114/sys/devices/system/cpu/cpu3/cpuidle/state3/usage:9217

0 0