mysqld causes 2-3 wakeups per second on idle

Bug #640472 reported by Luis Silva
This bug affects 4 people
Affects Status Importance Assigned to Milestone
MySQL Server
mysql-5.5 (Ubuntu)

Bug Description

mysqld-akonadi consistently causes 2 to 3 wakeups per second on idle on my machine. This makes it the highest cause of wakeups coming from a user source for me. By comparison, virtuoso-t, used by nepomuk causes 0.5 wakeups per second.
Is there a way to tweak mysql to wake up less frequently?
Architecture: amd64
CheckboxSubmission: 46db008fca60ff4eb912f9c7f988bb35
CheckboxSystem: 2954e74ba17fb0e37fc942cd1d9fab4e
DistroRelease: Ubuntu 10.10
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
Package: mysql-server-core-5.1 5.1.49-1ubuntu8
PackageArchitecture: amd64
 PATH=(custom, user)
ProcVersionSignature: Ubuntu 2.6.35-21.31-generic
Tags: maverick
Uname: Linux 2.6.35-21-generic x86_64
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare users video

Revision history for this message
Luis Silva (lacsilva) wrote :

Wrong package.

tags: added: apport-collected
description: updated
Revision history for this message
Luis Silva (lacsilva) wrote : Dependencies.txt

apport information

Revision history for this message
Luis Silva (lacsilva) wrote :

Here is the log powertop generated.

Scott Moser (smoser)
Changed in mysql-5.1 (Ubuntu):
importance: Undecided → Wishlist
status: New → Confirmed
Revision history for this message
Clint Byrum (clint-fewbar) wrote :

Moving to 5.5 as wishlist bugs won't be backported to prior releases.

affects: mysql-5.1 (Ubuntu) → mysql-5.5 (Ubuntu)
Revision history for this message
Morgan Tocker (morgo) wrote :

I've filed a feature request with upstream. In 5.1/5.5 the InnoDB storage engine will have a background thread that wakes up every one second.

In future versions there will be more threads for background work (as this is required for multi-core scalability), so it is an interesting question how this will affect battery life.

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