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[Xen-devel] [PATCH] Change default cpufreq governor to ondemand
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-devel] [PATCH] Change default cpufreq governor to ondemand |
| From: | John Haxby <john.haxby@xxxxxxxxxx> |
| Date: | Fri, 15 Jan 2010 16:25:15 +0000 |
| Delivery-date: | Fri, 15 Jan 2010 08:26:38 -0800 |
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Back in c/s 18950 the default cpufreq governor was set to userspace (it had previously been performance). However, since there is no supplied userspace program or script that will change the frequency this is at best a no-op. Worse, on some hardware with some BIOS revisions, this actually sets the CPUs running at their lowest frequency rather than their highest and there is a corresponding (and initially puzzling) drop in performance. This patch changes the default governor to "ondemand" which should make it the same as the Linux default and will provide power savings for the majority without needing to write a userspace governor. For those that want to install their own governor, that is still possible. Signed-off-by: John Haxby <john.haxby@xxxxxxxxxx>
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