Bug 676412

Summary:	Excessive kernel wakeups on a nw9440
Product:	[Fedora] Fedora	Reporter:	Richard Allen <ra>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED INSUFFICIENT_DATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	14	CC:	gansalmon, itamar, jfeeney, jonathan, kernel-maint, madhu.chinakonda, rvandolson
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-08-29 19:20:21 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Richard Allen 2011-02-09 19:10:19 UTC

Description of problem:
[kernel scheduler] Load balancing tick is way to busy

Version-Release number of selected component (if applicable):
2.6.35.10-74.fc14.i686


How reproducible:
Run powertop, admire how busy the load balancing tick is

Steps to Reproduce:
1. run powertop

  
Actual results:
Top causes for wakeups:
  70.8% (815.4)   [kernel scheduler] Load balancing tick
   6.2% ( 71.1)   firefox
   4.7% ( 54.3)   [uhci_hcd:usb4, yenta, tifm_7xx1] <interrupt>
   4.7% ( 54.3)   USB device  4-1 : Logitech USB Optical Mouse (Logitech)
   4.3% ( 49.0)   [iwl3945] <interrupt>
   3.5% ( 40.6)   thunderbird-bin

Expected results:
A system that is responcive and works for me and not the kernel loadbalancing tick.  

Additional info:
As specified in bug 635813 I am opening a new bug report for this on my machine.  It is a HP nw9440 running an up to date fedora 14 i686. On my machine the tick is responcible for 50-80% of all wakeups constantly.

Comment 1 Matthew Garrett 2011-02-10 04:18:07 UTC

This doesn't seem to be an idle system - there's a lot of wakeups from firefox and there's interrupts from mouse activity. If you kill thunderbird and firefox and don't touch the mouse, how does it look?

Comment 2 Ray Van Dolson 2011-03-16 20:03:55 UTC

Richard, just curious -- what are the side-effects of all of these wake-ups?  Fan constantly running by chance?

Also have an NW9440 on Fedora 14 i686 and the fan is constantly running on it.  Rebooting the same machine into XP results in a idle fan and less heat...

Will try powertop later and share results.

Comment 3 Josh Boyer 2011-08-29 19:20:21 UTC

In needinfo for more than 6mo.  If this still happens on f15 or f16, please open a new bug.