https://bugzilla.kernel.org/show_bug.cgi?id=81441
Bug ID: 81441
Summary: kacpi_notify wakes CPU from C-States for too long
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32-419.el6.x86_64
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: blocking
Priority: P1
Component: Config-Interrupts
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Steps to reproduce:
1. Make the OS to work in idle mode
2. Keep changing CPU P-State with IPMI set max allowed CPU P-State/T-State
command 2 times per second
3. Use Powertop to log reasons of waking CPUs from C-States
Observations:
1. kacpi_notify process takes ~100 ms/s over 20 seconds, by two system deamons
log from Powertop:
Summary: 342.5 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and 7.3%
CP
Usage Events/s Category Description
23.4 ms/s 171.6 Process [kacpi_notify]
2. After kacpi_notify is done, CPU does not return to C-States immidiately.
Environment:
2x Intel Xeon CPUs, 320GB DDR4, RHEL 6.5
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