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RE: [Xen-devel] How can I scaling CPU frequency in Xen-3.3.0?

  • To: zhangxiang <zhangxiang@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Yu, Ke" <ke.yu@xxxxxxxxx>
  • Date: Wed, 1 Oct 2008 16:58:44 +0800
  • Accept-language: en-US
  • Acceptlanguage: en-US
  • Cc:
  • Delivery-date: Wed, 01 Oct 2008 01:59:19 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AckiypZyAtUyrB16S5mnnxds915yKwA2S5qw
  • Thread-topic: [Xen-devel] How can I scaling CPU frequency in Xen-3.3.0?

Recent cset 18543 (http://xenbits.xensource.com/xen-unstable.hg?rev/7592da5118ec) has provided userspace utility xenpm to get Px related information. you can try this.
BTW, cpufreq scaling is disabled by default, don't forget to enable it by adding xen grub option "cpufreq=xen".
Best Regards

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of zhangxiang
Sent: 2008年9月30日 15:02
To: xen-devel
Subject: [Xen-devel] How can I scaling CPU frequency in Xen-3.3.0?

Hello Everybody:
   I know that Xen-3.3.0 supports CPU frequency scaling in the userspace, and hypercall interface is created for such purpose (tools/libxc/xc_pm.c).
   But how can I use this interface in the userspace of D0? Should I have to write some programs or scripts? Is there any tools to use this function?
   Thank you very much!

                                                                                                                                    National Research Center for Intelligent Computing Systems,

                                                                                                                                Institute of Computing Technology, Chinese Academy of Sciences

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