https://bugzilla.kernel.org/show_bug.cgi?id=22332
Summary: 10Ks of wakeups in tickless kernel
Product: ACPI
Version: 2.5
Kernel Version: 2.6.36
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
Latest working kernel version: 2.6.27
Earliest failing kernel version: 2.6.30-r5 (perhaps earlier)
Distribution: gentoo Stable
Hardware Environment: Thinkpad R51e w/ Intel Pentium M 1.73 GHz
Even when not-starting X11 powertop reports a very high amount of wakeups
without visible reasons for it. The wakeup count for single sources max out
around 50/s, while the wakeup count reaches values from 10.000 to 80.000.
/proc/interupts reflects the wakeups displayed by powertop while
/sys/firmware/acpi/interrupts/* shows 0-2 interrupts. As a result the CPU
seldom reaches C3 and the power consumption is high.
In 2.6.27 wakeup count of the tickless kernel stays around 100 when idle, 50
without X11. After learning about
https://bugzilla.kernel.org/show_bug.cgi?id=12788 I disabled NOHZ and got a
system with around 200 wakeups.
Steps: to reproduce: just boot any tickless kernel
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