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== Comment: #0 - Shilpasri G. Bhat <shigb...@in.ibm.com> - 2015-05-06 07:24:11
==
The user can see a drop in performance when frequency is throttled and
is unaware of throttling. So detect and report such a condition, so
the user can check the OCC status to reboot the system or check for
power supply or fan failures.
The cpu frequency can be throttled by OCC for the following reasons:
1)If a processor crosses its power and temperature limit then OCC will
lower its Pmax to reduce the frequency and voltage.
2)If OCC crashes then the system is forced to Psafe frequency.
3)If OCC fails to recover then the kernel is not allowed to do any
further frequency changes and the chip will remain in Psafe.
This bug is fixed upstream 09a972d1620934142d30cfda455ffe429af751c4
---uname output---
3.19.0-15
Machine Type = llmtul02b.in.ibm.com
Contact Information = Shilpasri G Bhat / shilpa.b...@linux.vnet.ibm.com
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: architecture-ppc64le bot-comment bugnameltc-124690 severity-medium
targetmilestone-inin1504
--
Report cpu frequency throttling
https://bugs.launchpad.net/bugs/1452547
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