[Bug 122993] Re: ondemand governor does not use maximum frequency under load

[unggnu]

This is still an issue in Intrepid. I have a quad core q6600 and it seems that the ondemand governor uses the highest frequency very rarely.
If I set one core under 100% load e.g. with cpuburn ondemand doesn't scale up. Most of the times it even doesn't scale up if two cores are under 100% load or it jumps up and down. The only case when always the highest frequency was used is if four tasks of burnP6 running.
If I compress a video with mencoder and four threads to H264 (at least 60% load all the time) frequency still jumps up an down while most of the time the lowest one is used.
The worst case is if I use mprime (ftp://mersenne.org/gimps/mprime257-linux64.tar.gz) system monitor shows that all cores are under 100% load but ondemand still uses 1.6 Ghz instead of 2.4.
If one core is under or nearly 100% load ondemand should scale up. Everything else would slow the system. 

uname -a
Linux pc 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:06 UTC 2008 x86_64 GNU/Linux

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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ondemand governor does not use maximum frequency under load
https://bugs.launchpad.net/bugs/122993
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