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Message #128093
[Bug 1472293] Re: load >= 1 while idle for no obvious reason with ACPI
perf top - here's a copy of the screen's first lines.
Samples: 1K of event 'cycles', Event count (approx.): 669342282
Overhead Shared Object Symbol
6,47% [kernel] [k] number.isra.2
6,18% [kernel] [k] format_decode
6,17% [kernel] [k] kallsyms_expand_symbol.constprop.1
5,00% [kernel] [k] vsnprintf
3,88% [kernel] [k] strnlen
2,88% [kernel] [k] string.isra.7
2,76% perf [.] 0x000000000005a0b7
2,41% libc-2.21.so [.] memchr
2,29% [kernel] [k] pointer.isra.19
1,88% libc-2.21.so [.] getdelim
1,70% perf [.] 0x0000000000061b9c
1,53% libc-2.21.so [.] 0x000000000014f054
1,35% libc-2.21.so [.] __libc_calloc
1,30% libc-2.21.so [.] 0x000000000014de22
1,24% libc-2.21.so [.] _IO_feof
1,19% [kernel] [k] apparmor_capable
0,94% [kernel] [k] seq_read
0,88% [kernel] [k] module_get_kallsym
0,82% [kernel] [k] s_show
0,77% perf [.] 0x0000000000063917
0,76% [kernel] [k] clear_page
0,71% [kernel] [k] update_iter
0,70% perf [.] 0x0000000000061bae
0,65% [kernel] [k] s_next
0,59% [kernel] [k] seq_vprintf
0,59% libc-2.21.so [.] strlen
0,53% [kernel] [k] copy_user_generic_unrolled
0,53% perf [.] 0x000000000009f873
0,41% libc-2.21.so [.] 0x000000000014f058
0,41% libc-2.21.so [.] 0x000000000008e179
0,41% libc-2.21.so [.] 0x000000000008e14a
0,41% perf [.] 0x0000000000063904
0,41% perf [.] 0x000000000009f899
0,41% perf [.] 0x000000000009f887
0,41% perf [.] 0x0000000000061bab
0,35% libc-2.21.so [.] 0x000000000008e182
0,35% perf [.] 0x000000000009f884
0,35% [kernel] [k] rw_verify_area
0,35% [kernel] [k] strlcpy
0,35% [kernel] [k] update_wall_time
0,35% [kernel] [k] memcpy
0,30% [kernel] [k] cap_capable
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https://bugs.launchpad.net/bugs/1472293
Title:
load >= 1 while idle for no obvious reason with ACPI
Status in linux package in Ubuntu:
Confirmed
Bug description:
My idling server will stay at load >=1 if ACPI is active, for no
obvious reason.
Adding "acpi=off" to grub will resolve this and load falls to 0.0x as
expected.
But I use the power button to tell the box to shut down and without
ACPI, systemd cannot respond to the power button's ACPI event.
My server is an Acer Easystore H340, that's a small NAS box with four
disk bays and an Atom 230 in it. That's standard x86 hardware capable
of running x86_64 kernels.
Recently, it was upgraded from 14.10 to 15.04 x86_64. Only after that
upgrade did I notice the load >= 1 problem, although it may have been
there in previous releases, already.
No idea how to debug this.
To resolve this, I either need
- a way to fix load >= 1 with ACPI
or
- a way to respond to the power button without ACPI
Thanks.
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 9 09:24 seq
crw-rw---- 1 root audio 116, 33 Jul 9 09:24 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 15.04
InstallationDate: Installed on 2015-03-16 (115 days ago)
InstallationMedia: Ubuntu-Server 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: Acer Aspire easyStore H340
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-22-generic root=UUID=956a13ed-762e-4b00-8688-67f6339d5c37 ro nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
RelatedPackageVersions:
linux-restricted-modules-3.19.0-22-generic N/A
linux-backports-modules-3.19.0-22-generic N/A
linux-firmware 1.143.1
RfKill: Error: [Errno 2] No such file or directory
Tags: vivid vivid
Uname: Linux 3.19.0-22-generic x86_64
UnreportableReason: The report belongs to a package that is not installed.
UpgradeStatus: Upgraded to vivid on 2015-04-24 (76 days ago)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 02/03/2009
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: P03
dmi.board.asset.tag: 0123456789
dmi.board.name: WG945GCM
dmi.board.vendor: Acer
dmi.board.version: -1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: Acer
dmi.chassis.version: A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrP03:bd02/03/2009:svnAcer:pnAspireeasyStoreH340:pvr-1:rvnAcer:rnWG945GCM:rvr-1:cvnAcer:ct1:cvrA:
dmi.product.name: Aspire easyStore H340
dmi.product.version: -1
dmi.sys.vendor: Acer
---
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
DistroRelease: Ubuntu 15.04
InstallationDate: Installed on 2015-03-16 (125 days ago)
InstallationMedia: Ubuntu-Server 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
Package: linux (not installed)
Tags: vivid
Uname: Linux 3.12.44-031244-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: Upgraded to vivid on 2015-04-24 (87 days ago)
UserGroups:
_MarkForUpload: True
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References
