linux-kernel - Re: [PATCH v2] intel_idle: add idle values for Cherrytrail/Braswell

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Date:	Tue, 26 Aug 2014 10:38:32 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	Len Brown <lenb@...nel.org>,
	Kumar P Mahesh <mahesh.kumar.p@...el.com>,
	Alan Cox <alan@...ux.intel.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] intel_idle: add idle values for Cherrytrail/Braswell

On 2014/8/25 18:12, Mika Westerberg wrote:
> On Fri, Aug 22, 2014 at 10:06:21PM +0800, Li, Aubrey wrote:
>> On 2014/8/22 19:39, Mika Westerberg wrote:
>>> From: Mahesh Kumar P <mahesh.kumar.p@...el.com>
>>>
>>> Cherrytrail/Braswell is a successor of Intel Baytrail but has slighly
>>> different CPU idle values and latencies.
>>>
>>> Signed-off-by: Kumar P Mahesh <mahesh.kumar.p@...el.com>
>>> Signed-off-by: Alan Cox <alan@...ux.intel.com>
>>> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
>>> ---
>>> I learned from Mahesh that C1e, C4 and S0i2 states are deprecated so those
>>> are now removed.
>>
>> If the platform has ACPI supported, I believe Len wants to see what
>> C-states number exported by ACPI.
>>
>> Please boot the machine with "intel_idle.max_cstate=0" to disable
>> intel_idle, then post the output of the following commands
> 
> OK, here goes:

ACPI exposes 0x58 as C6 mwait hint while the patch proposes 0x52 for C6.
Can you please remove "intel_idle.max_cstate=0" and run "dmesg | grep
idle" again to see how many C6 supports in CPUID enumeration?

Thanks,
-Aubrey

> 
>> dmesg | grep idle
> 
> [    0.523624] cpuidle: using governor ladder
> [    0.528215] cpuidle: using governor menu
> [   16.649461] intel_idle: disabled
> [   16.736481] 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/residency:0
> /sys/devices/system/cpu/cpu0/cpuidle/state0/time:0
> /sys/devices/system/cpu/cpu0/cpuidle/state0/usage:0
> /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/residency:2
> /sys/devices/system/cpu/cpu0/cpuidle/state1/time:1255076
> /sys/devices/system/cpu/cpu0/cpuidle/state1/usage:763
> /sys/devices/system/cpu/cpu0/cpuidle/state2/desc:ACPI FFH INTEL MWAIT 0x58
> /sys/devices/system/cpu/cpu0/cpuidle/state2/disable:0
> /sys/devices/system/cpu/cpu0/cpuidle/state2/latency:500
> /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/residency:1000
> /sys/devices/system/cpu/cpu0/cpuidle/state2/time:1694866
> /sys/devices/system/cpu/cpu0/cpuidle/state2/usage:639
> /sys/devices/system/cpu/cpu0/cpuidle/state3/desc:ACPI FFH INTEL MWAIT 0x64
> /sys/devices/system/cpu/cpu0/cpuidle/state3/disable:0
> /sys/devices/system/cpu/cpu0/cpuidle/state3/latency:5000
> /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/residency:10000
> /sys/devices/system/cpu/cpu0/cpuidle/state3/time:380547473
> /sys/devices/system/cpu/cpu0/cpuidle/state3/usage:744
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