** Changed in: linux (Ubuntu Vivid)
Status: New => Fix Committed
--
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/1452547
Title:
Report cpu frequency throttling
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Vivid:
Fix Committed
Bug description:
[Impact]
== 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.
[Test Case]
Get into a state where hardware OCC throttles CPU frequency.
Ensure kernel log shows cpufreq throttling messages.
[Fix]
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1452547/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
