Re: [PATCH v2 0/8] Fix performance issue with ondemand governor
From: Rik van Riel
Date: Mon May 24 2010 - 16:45:38 EST
On 05/09/2010 01:49 PM, Ingo Molnar wrote:
* Arjan van de Ven<arjan@xxxxxxxxxxxxx> wrote:
[Version 2 includes the acks/etc. Andrew: no changes from the patches that
are in -mm]
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...
I've applied your series to sched/core and started testing it, thanks Arjan!
This code seems to help significantly with some workloads,
allowing more systems to use the ondemand governor (and
having fewer systems waste power by using the performance
governor all the time).
It would be nice to see it in 2.6.35
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