Public bug reported:
On upgrading to kernel 2.6.28-8.24, I noticed a very significant
regression in the responsiveness of desktop applications: firefox became
unreasonably slow to load pages, and screen redraws for things like
switching tabs in xchat, gnome-terminal etc. went from being to
instantaneous to taking a human-visible amount of time to process.
Adding the cpufreq panel applet revealed that my CPU was scaled back
from 3GHz to 375MHz, and being excessively conservative about scaling up
under load. Resetting to the performance governor cured the problem.
I suggest that the ondemand governor in some hardware may not be a
viable default.
ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
MachineType: Supermicro P8SAA
NonfreeKernelModules: nvidia
Package: linux-image-2.6.28-8-generic 2.6.28-8.24
ProcCmdLine: root=LABEL=epsilon ro ht=on
ProcEnviron:
LC_COLLATE=C
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-8.24-generic
SourcePackage: linux
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug regression-potential
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Significant performance regression in 2.6.28-8.24 due to ondemand governor
https://bugs.launchpad.net/bugs/332017
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