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RE: [Xen-devel][PATCH] Change default cpufreq governor from performance to ondemand

  • To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Liu, Jinsong" <jinsong.liu@xxxxxxxxx>
  • Date: Thu, 11 Dec 2008 22:59:57 +0800
  • Accept-language: en-US
  • Acceptlanguage: en-US
  • Cc:
  • Delivery-date: Thu, 11 Dec 2008 07:00:28 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AclbUiS/4KU3CXoUTsmvTaHYHJcTuwAMKXekAAC79qAAAnNuTAAEKBaA
  • Thread-topic: [Xen-devel][PATCH] Change default cpufreq governor from performance to ondemand

Keir Fraser wrote:
> On 11/12/2008 11:52, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote:
>> Sorry, I didn't speak clear the reason why we change default cpufreq
>> governor from 'performance' to 'ondemand'.
>> We send out user PM interface patch yesterday, at that time the
>> default governor is 'performance', which is similar to the default
>> setting of native linux. However, since we didn't send out xenpm
>> tools until now, and considering people want to test 'ondemand'
>> governor, we temporarily set default governor as 'ondemand', as what
>> we did recently. 
>> After we send out xenpm tools, we will set default governor as
>> 'performance' again. At that time, user can use xenpm tool to change
>> cpufreq governor to 'ondemand' on-the-fly if he want.
> Perhaps a boot-time option to set the initial default would be better?
>  -- Keir

En, in fact we also think this solution, let command line parse to set initial 
default governor.
However, it also need user to set at grub, compared with xenpm, seems xenpm 
tool is some convenient to user, since by xenpm user can get initial default 
governor and change governor on the fly.
It's my draft thinking, and we can add boot-time option ASAP once you think 

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