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Subject[PATCH 0/7] Fix performance issue with ondemand governor
There have been various reports of the ondemand governor causing some
serious performance issues, one of the latest ones from Andrew.
There are several fundamental issues with ondemand (being worked on),
but the report from Andrew can be fixed relatively easily.

The fundamental issue is that ondemand will go to a (too) low CPU
frequency for workloads that alternatingly disk and CPU bound...

Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,

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