linux-kernel - Re: [PATCH] intel_idle: Add CPU model 54 (Atom N2000 series)

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Date:	Tue, 11 Feb 2014 06:43:42 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Len Brown <lenb@...nel.org>
CC:	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] intel_idle: Add CPU model 54 (Atom N2000 series)

On 2014-02-11 01:01, Len Brown wrote:
> Please send the output of these two command before and after the patch:
> 
> dmesg | grep idle
> grep . /sys/devices/system/cpu/cpu0/cpuidle/*/*

Before:
# dmesg | grep idle
[    0.648783] cpuidle: using governor ladder
[    0.648787] cpuidle: using governor menu
[    1.053215] intel_idle: does not run on family 6 model 54
[    3.285430] ACPI: acpi_idle registered with cpuidle
# grep . /sys/devices/system/cpu/cpu0/cpuidle/*/*
/sys/devices/system/cpu/cpu0/cpuidle/state0/desc:CPUIDLE CORE POLL IDLE
/sys/devices/system/cpu/cpu0/cpuidle/state0/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/latency:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/name:POLL
/sys/devices/system/cpu/cpu0/cpuidle/state0/power:4294967295
/sys/devices/system/cpu/cpu0/cpuidle/state0/time:443
/sys/devices/system/cpu/cpu0/cpuidle/state0/usage:5
/sys/devices/system/cpu/cpu0/cpuidle/state1/desc:ACPI FFH INTEL MWAIT 0x0
/sys/devices/system/cpu/cpu0/cpuidle/state1/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/latency:1
/sys/devices/system/cpu/cpu0/cpuidle/state1/name:C1
/sys/devices/system/cpu/cpu0/cpuidle/state1/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/time:420944
/sys/devices/system/cpu/cpu0/cpuidle/state1/usage:1798
/sys/devices/system/cpu/cpu0/cpuidle/state2/desc:ACPI FFH INTEL MWAIT 0x10
/sys/devices/system/cpu/cpu0/cpuidle/state2/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state2/latency:20
/sys/devices/system/cpu/cpu0/cpuidle/state2/name:C2
/sys/devices/system/cpu/cpu0/cpuidle/state2/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state2/time:119479360
/sys/devices/system/cpu/cpu0/cpuidle/state2/usage:32863
/sys/devices/system/cpu/cpu0/cpuidle/state3/desc:ACPI FFH INTEL MWAIT 0x30
/sys/devices/system/cpu/cpu0/cpuidle/state3/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state3/latency:100
/sys/devices/system/cpu/cpu0/cpuidle/state3/name:C3
/sys/devices/system/cpu/cpu0/cpuidle/state3/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state3/time:1673
/sys/devices/system/cpu/cpu0/cpuidle/state3/usage:7
/sys/devices/system/cpu/cpu0/cpuidle/state4/desc:ACPI FFH INTEL MWAIT 0x52
/sys/devices/system/cpu/cpu0/cpuidle/state4/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state4/latency:140
/sys/devices/system/cpu/cpu0/cpuidle/state4/name:C4
/sys/devices/system/cpu/cpu0/cpuidle/state4/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state4/time:125622
/sys/devices/system/cpu/cpu0/cpuidle/state4/usage:63

After:
# dmesg | grep idle
[    0.244640] cpuidle: using governor ladder
[    0.244645] cpuidle: using governor menu
[    0.654351] intel_idle: MWAIT substates: 0x3020220
[    0.654355] intel_idle: v0.4 model 0x36
[    0.654359] intel_idle: lapic_timer_reliable_states 0xffffffff
# grep . /sys/devices/system/cpu/cpu0/cpuidle/*/*
/sys/devices/system/cpu/cpu0/cpuidle/state0/desc:CPUIDLE CORE POLL IDLE
/sys/devices/system/cpu/cpu0/cpuidle/state0/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/latency:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/name:POLL
/sys/devices/system/cpu/cpu0/cpuidle/state0/power:4294967295
/sys/devices/system/cpu/cpu0/cpuidle/state0/time:572
/sys/devices/system/cpu/cpu0/cpuidle/state0/usage:12
/sys/devices/system/cpu/cpu0/cpuidle/state1/desc:MWAIT 0x00
/sys/devices/system/cpu/cpu0/cpuidle/state1/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/latency:10
/sys/devices/system/cpu/cpu0/cpuidle/state1/name:C1E-ATM
/sys/devices/system/cpu/cpu0/cpuidle/state1/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/time:722013
/sys/devices/system/cpu/cpu0/cpuidle/state1/usage:3132
/sys/devices/system/cpu/cpu0/cpuidle/state2/desc:MWAIT 0x10
/sys/devices/system/cpu/cpu0/cpuidle/state2/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state2/latency:20
/sys/devices/system/cpu/cpu0/cpuidle/state2/name:C2-ATM
/sys/devices/system/cpu/cpu0/cpuidle/state2/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state2/time:4512127
/sys/devices/system/cpu/cpu0/cpuidle/state2/usage:9147
/sys/devices/system/cpu/cpu0/cpuidle/state3/desc:MWAIT 0x30
/sys/devices/system/cpu/cpu0/cpuidle/state3/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state3/latency:100
/sys/devices/system/cpu/cpu0/cpuidle/state3/name:C4-ATM
/sys/devices/system/cpu/cpu0/cpuidle/state3/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state3/time:1996954
/sys/devices/system/cpu/cpu0/cpuidle/state3/usage:2696
/sys/devices/system/cpu/cpu0/cpuidle/state4/desc:MWAIT 0x52
/sys/devices/system/cpu/cpu0/cpuidle/state4/disable:0
/sys/devices/system/cpu/cpu0/cpuidle/state4/latency:140
/sys/devices/system/cpu/cpu0/cpuidle/state4/name:C6-ATM
/sys/devices/system/cpu/cpu0/cpuidle/state4/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state4/time:266926331
/sys/devices/system/cpu/cpu0/cpuidle/state4/usage:73695

> 
> How did you measure power on the the DN2800MT, and on what workload?

I measured the input current of the board @12V. In both cases, the
system was idle in single-user mode, practically no processes running.

Jan



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