DVFS, xenpm in 3.4.1 and linux 2.6.18

DVFS, xenpm in 3.4.1 and linux 2.6.18

[Hui Kang]

Hi, All,
I have some problem of using dvfs in Xen 3.4.1 and 2.6.18 kernel. I 
enabled Speed option in BIOS and add "cpufreq=xen" in the grub file. But 
when I entered my dom0 and type "xenpm get-cpufreq-XXX" (any xenpm 
argument), it returns "[CPU0] failed to get CPU P state".
I am wondering if I should enable some feature of 2.6.18 during the 
kernel configuration. Does anyone have any solution to this? Thanks.

- Hui

RE: DVFS, xenpm in 3.4.1 and linux 2.6.18

[Yu, Ke]

There is no special config needed to enable DVFS, it is enabled by default. From your description, it is not easy to decide if it is BIOS issue or SW issue.

One immediate thing you can try is to use pv_ops dom0 with rebase/master branch, that have latest dom0 acpi parser with numerous bug fix.

BTW, the dom0 dmesg and xen dmesg is also helpful, you can get it by
# dmesg > dom0-msg.txt
# xm dmes >xen-msg.txt

Best Regards
Ke 

-----Original Message-----
From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Hui Kang
Sent: Saturday, September 12, 2009 3:48 AM
To: xen-users@lists.xensource.com; Xen-devel
Subject: [Xen-devel] DVFS, xenpm in 3.4.1 and linux 2.6.18 

Hi, All,
I have some problem of using dvfs in Xen 3.4.1 and 2.6.18 kernel. I 
enabled Speed option in BIOS and add "cpufreq=xen" in the grub file. But 
when I entered my dom0 and type "xenpm get-cpufreq-XXX" (any xenpm 
argument), it returns "[CPU0] failed to get CPU P state".
I am wondering if I should enable some feature of 2.6.18 during the 
kernel configuration. Does anyone have any solution to this? Thanks.

- Hui


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