[Kernel-packages] [Bug 1790602] Comment bridged from LTC Bugzilla
--- Comment From mranw...@us.ibm.com 2018-09-11 17:31 EDT---
That package didn't have what I needed so I just symlink'd the -34 version to
-35 - doesn't sound like there's much change.
With that and your kernel it looks good:
user@deb3qwsp1:~$ cat /proc/version
Linux version 4.15.0-35-generic (kamal@kathleen) (gcc version 7.3.0 (Ubuntu
7.3.0-16ubuntu3)) #38 SMP Wed Sep 5 15:07:24 UTC 2018
user@deb3qwsp1:~$ cpupower monitor sleep 30
sleep took 30.02114 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop | stop | stop | stop | stop | stop | stop
0| 0| 0| 0.09| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.12| 99.66
0| 0| 1| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 96.70
0| 0| 2| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 95.84
0| 0| 3| 2.54| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 96.71
0| 4| 4| 0.43| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.41| 94.66
0| 4| 5| 0.47| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 26.69| 68.68
0| 4| 6| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 95.84
0| 4| 7| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 95.84
Thanks!
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https://bugs.launchpad.net/bugs/1790602
Title:
Ubuntu18.04.1: cpuidle: powernv: Fix promotion from snooze if next
state disabled (performance)
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Bionic:
Fix Committed
Bug description:
== Comment: #0 - Michael Ranweiler - 2018-09-04
00:50:14 ==
The CPUs remain in snooze state on an idle system when only the
shallow states disabled resulting in increased power consumption.
The commit 78eaa10f027c ("cpuidle: powernv/pseries: Auto-promotion of snooze
to deeper idle state") introduced a timeout for the snooze idle state so that
it could be eventually be promoted to a deeper idlestate. The snooze
timeout value is static and set to the target residency of the next idle
state, which would train the cpuidle governor to pick the next idle state
eventually.
The unfortunate side-effect of this is that if the next idle state(s) is
disabled, the CPU will forever remain in snooze, despite the fact that the
system is completely idle, and other deeper idle states are available.
This patch fixes the issue by dynamically setting the snooze timeout to the
target residency of the next enabled state on the device.
Before Patch:
POWER8 : Only nap disabled.
$ cpupower monitor sleep 30
sleep took 30.01297 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | Nap | Fast
0| 8| 0| 96.41| 0.00| 0.00
0| 8| 1| 96.43| 0.00| 0.00
0| 8| 2| 96.47| 0.00| 0.00
0| 8| 3| 96.35| 0.00| 0.00
0| 8| 4| 96.37| 0.00| 0.00
0| 8| 5| 96.37| 0.00| 0.00
0| 8| 6| 96.47| 0.00| 0.00
0| 8| 7| 96.47| 0.00| 0.00
POWER9: Shallow states (stop0lite, stop1lite, stop2lite, stop0, stop1, stop2)
disabled:
$ cpupower monitor sleep 30
sleep took 30.05033 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop | stop | stop | stop | stop | stop |
stop
0| 16| 0| 89.79| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
0| 16| 1| 90.12| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
0| 16| 2| 90.21| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
0| 16| 3| 90.29| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
After Patch:
POWER8 : Only nap disabled.
$ cpupower monitor sleep 30
sleep took 30.01200 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | Nap | Fast
0| 8| 0| 16.58| 0.00| 77.21
0| 8| 1| 18.42| 0.00| 75.38
0| 8| 2| 4.70| 0.00| 94.09
0| 8| 3| 17.06| 0.00| 81.73
0| 8| 4| 3.06| 0.00| 95.73
0| 8| 5| 7.00| 0.00| 96.80
0| 8| 6| 1.00| 0.00| 98.79
0| 8| 7| 5.62| 0.00| 94.17
POWER9: Shallow states (stop0lite, stop1lite, stop2lite, stop0, stop1,
stop2) disabled:
$ cpupower monitor sleep 30
sleep took 30.02110 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop | stop | stop | stop | stop | stop |
stop
0| 0| 0| 0.69| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 9.39|
89.70
0| 0| 1| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.05|
93.21
0| 0| 2| 0.00| 0.00| 0.00| 0.0
[Kernel-packages] [Bug 1790602] Comment bridged from LTC Bugzilla
--- Comment From mranw...@us.ibm.com 2018-09-05 17:50 EDT---
I recreated on the old kernel:
user@deb3qwsp1:~$ cat /proc/version
Linux version 4.15.0-33-generic (buildd@bos02-ppc64el-007) (gcc version 7.3.0
(Ubuntu 7.3.0-16ubuntu3)) #36-Ubuntu SMP Wed Aug 15 13:42:39 UTC 2018
user@deb3qwsp1:~$ for i in `seq 1 6`; do sudo cpupower idle-set -d $i; done
Idlestate 1 disabled on CPU 0
Idlestate 1 disabled on CPU 1
Idlestate 1 disabled on CPU 2
user@deb3qwsp1:~$ cpupower monitor sleep 30
sleep took 30.02607 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop | stop | stop | stop | stop | stop | stop
0| 0| 0| 87.88| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00
0| 0| 1| 87.95| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00
0| 0| 2| 88.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00
0| 0| 3| 87.97| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00
And I booted the new kernel:
user@deb3qwsp1:~$ cat /proc/version
Linux version 4.15.0-35-generic (kamal@kathleen) (gcc version 7.3.0 (Ubuntu
7.3.0-16ubuntu3)) #38 SMP Wed Sep 5 15:07:24 UTC 2018
But looks like cpupower is part of linux-tools-4.15.0-35-generic and
just the linux-tools-common and linux-tools-hosts is available.
Can you please upload the linux-
tools-4.15.0-35-generic_4.15.0-35.38_ppc64el.deb and I can finish the
verification?
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1790602
Title:
Ubuntu18.04.1: cpuidle: powernv: Fix promotion from snooze if next
state disabled (performance)
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Bionic:
Triaged
Bug description:
== Comment: #0 - Michael Ranweiler - 2018-09-04
00:50:14 ==
The CPUs remain in snooze state on an idle system when only the
shallow states disabled resulting in increased power consumption.
The commit 78eaa10f027c ("cpuidle: powernv/pseries: Auto-promotion of snooze
to deeper idle state") introduced a timeout for the snooze idle state so that
it could be eventually be promoted to a deeper idlestate. The snooze
timeout value is static and set to the target residency of the next idle
state, which would train the cpuidle governor to pick the next idle state
eventually.
The unfortunate side-effect of this is that if the next idle state(s) is
disabled, the CPU will forever remain in snooze, despite the fact that the
system is completely idle, and other deeper idle states are available.
This patch fixes the issue by dynamically setting the snooze timeout to the
target residency of the next enabled state on the device.
Before Patch:
POWER8 : Only nap disabled.
$ cpupower monitor sleep 30
sleep took 30.01297 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | Nap | Fast
0| 8| 0| 96.41| 0.00| 0.00
0| 8| 1| 96.43| 0.00| 0.00
0| 8| 2| 96.47| 0.00| 0.00
0| 8| 3| 96.35| 0.00| 0.00
0| 8| 4| 96.37| 0.00| 0.00
0| 8| 5| 96.37| 0.00| 0.00
0| 8| 6| 96.47| 0.00| 0.00
0| 8| 7| 96.47| 0.00| 0.00
POWER9: Shallow states (stop0lite, stop1lite, stop2lite, stop0, stop1, stop2)
disabled:
$ cpupower monitor sleep 30
sleep took 30.05033 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop | stop | stop | stop | stop | stop |
stop
0| 16| 0| 89.79| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
0| 16| 1| 90.12| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
0| 16| 2| 90.21| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
0| 16| 3| 90.29| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00|
0.00
After Patch:
POWER8 : Only nap disabled.
$ cpupower monitor sleep 30
sleep took 30.01200 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | Nap | Fast
0| 8| 0| 16.58| 0.00| 77.21
0| 8| 1| 18.42| 0.00| 75.38
0| 8| 2| 4.70| 0.00| 94.09
0| 8| 3| 17.06| 0.00| 81.73
0| 8| 4| 3.06| 0.00| 95.73
0| 8| 5| 7.00| 0.00| 96.80
0| 8| 6| 1.00| 0.00| 98.79
0| 8| 7| 5.62| 0.00| 94.17
POWER9: Shallow states (stop0lite, stop1lite, stop2lite, stop0, stop1,
stop2) disabled:
$ cpupower monitor sleep 30
sleep took 30.02110 seconds and exited with status 0
|Idle_Stats
PKG |CORE|CPU | snoo | stop | stop | stop | stop | stop | stop | stop |
stop
0| 0| 0| 0.69| 0.00
