[Bug 1719545] Comment bridged from LTC Bugzilla

------- Comment From sthoufee@in.ibm.com 2019-01-30 06:00 EDT-------
We don't have access to the above link. please provide a valid link

------- Comment From sthoufee@in.ibm.com 2019-01-30 06:02 EDT-------
says

The requested URL /~jsalisbury/lp1719545 was not found on this server.

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Title:
[P9][LTCTest][Opal][FW910] cpupower monitor shows multiple stop
Idle_Stats

Status in The Ubuntu-power-systems project:
Confirmed
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Confirmed

Bug description:
== Comment: #0 - PAVAMAN SUBRAMANIYAM <pavsubra@in.ibm.com> - 2017-06-29 02:30:22 ==
---Problem Description---
cpupower monitor shows multiple stop Idle_Stats



---uname output---
Linux zz376p1 4.10.0-26-generic #30~16.04.1-Ubuntu SMP Tue Jun 27 09:38:48 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

Machine Type = P9

---Debugger---
A debugger is not configured

---Steps to Reproduce---
Install a P9 8375-42A Hardware with Ubuntu 16.04.3 OS.
Then execute the cpupower monitor command to fetch all the Idle_Stats values.

root@zz376p1:~# cpupower monitor
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop
0| 8| 0| 0.00| 0.00| 2.79
0| 8| 1| 0.00| 0.00| 70.68
0| 8| 2| 0.00| 0.00| 99.87
0| 8| 3| 0.00| 0.00| 67.28
0| 12| 4| 0.00| 0.00| 5.17
0| 12| 5| 0.00| 0.00| 12.50
0| 12| 6| 0.00| 0.00| 99.74
0| 12| 7| 0.00| 0.00| 0.00
8|2048| 8| 0.00| 0.00| 22.14
8|2048| 9| 0.00| 0.00| 102.3
8|2048| 10| 0.00| 0.00| 0.00
8|2048| 11| 0.00| 0.00| 99.97
8|2052| 12| 0.00| 0.00| 99.70
8|2052| 13| 0.00| 0.00| 23.86
8|2052| 14| 0.00| 0.00| 113.1
8|2052| 15| 0.00| 0.00| 0.00

As can be seen it shows 2 columns for stop.

root@zz376p1:~# uname -a
Linux zz376p1 4.10.0-26-generic #30~16.04.1-Ubuntu SMP Tue Jun 27 09:38:48 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

root@zz376p1:~# cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.2 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.2 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

root@zz376p1:~# cat /proc/cpuinfo | tail
processor : 15
cpu : POWER9 (raw), altivec supported
clock : 2600.000000MHz
revision : 1.0 (pvr 004e 0100)

timebase : 512000000
platform : PowerNV
model : 8375-42A
machine : PowerNV 8375-42A
firmware : OPAL

Userspace tool common name: /usr/bin/cpupower

The userspace tool has the following bit modes: 64-bit

Userspace rpm: linux-tools-common

Userspace tool obtained from project website: na

*Additional Instructions for pavsubra@in.ibm.com:
-Post a private note with access information to the machine that the bug is occuring on.
-Attach ltrace and strace of userspace application.


.
There are 3 idle_stats (3 states) in this system.

root@zz376p1:/sys/devices/system/cpu/cpu0/cpuidle/state2# cpupower monitor -l
Monitor "Idle_Stats" (3 states) - Might overflow after 4294967295 s
snoo [T] -> snooze
stop [T] -> stop0_lite
stop [T] -> stop1_lite

root@zz376p1:/sys/devices/system/cpu/cpu0/cpuidle/state2# cpupower idle-info
CPUidle driver: powernv_idle
CPUidle governor: menu
analyzing CPU 0:

Number of idle states: 3
Available idle states: snooze stop0_lite stop1_lite
snooze:
Flags/Description: snooze
Latency: 0
Usage: 224
Duration: 423
stop0_lite:
Flags/Description: stop0_lite
Latency: 0
Usage: 1685
Duration: 530522
stop1_lite:
Flags/Description: stop1_lite
Latency: 4
Usage: 12693
Duration: 5405898106

root@zz376p1:/sys/devices/system/cpu/cpu0/cpuidle/state2# cpupower monitor -l
Monitor "Idle_Stats" (3 states) - Might overflow after 4294967295 s
snoo [T] -> snooze
stop [T] -> stop0_lite
stop [T] -> stop1_lite
root@zz376p1:/sys/devices/system/cpu/cpu0/cpuidle/state2# cpupower idle-info
CPUidle driver: powernv_idle
CPUidle governor: menu
analyzing CPU 0:

Number of idle states: 3
Available idle states: snooze stop0_lite stop1_lite
snooze:
Flags/Description: snooze
Latency: 0
Usage: 272
Duration: 905
stop0_lite:
Flags/Description: stop0_lite
Latency: 0
Usage: 2141
Duration: 536399
stop1_lite:
Flags/Description: stop1_lite
Latency: 4
Usage: 15396
Duration: 6625668881


cpu monitor will print the results of all the 3 available idle_stats .

The first stop -> stop0_lite stats
and
The second stop -> stop1_lite stats.

cpupower monitor header prints the header list by getting the name of
the idle stats.

name (name description)
snoo [T] -> snooze
stop [T] -> stop0_lite
stop [T] -> stop1_lite

We can change the header to be more meaningful so user won't interpret
it as 2 columns for stop.

May be we need to change the code to print the header to use name description instead of name.
.
I will work on the patch and get it resolve.


== Comment: #8 - PAVAMAN SUBRAMANIYAM <pavsubra@in.ibm.com> - 2017-06-30 03:42:01 ==
I have executed the command again with the fixed cpupower utility.


Submitted patch upstream and awaiting response.

https://lkml.org/lkml/2017/7/31/177

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