[Xen-devel] xen 4.0 + DVFS

[Vinicius Petrucci <vpetrucci@xxxxxxxxx>]

hi,

i'm having some problems on using dvfs in Xen 4.0.

i'm running Ubuntu Server 10.04 with Xen 4.0 and Linux 2.6.32.10
paravirt_ops dom0
(i just followed the install steps from
http://lists.xensource.com/archives/html/xen-users/2010-03/msg00878.html)

The CPU model is: Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz
(with 4 cores)

When I type "xenpm get-cpufreq-para", it returns:

cpu id               : 0
affected_cpus        : *0
cpuinfo frequency    : max [2793000] min [1197000] cur [1197000]
scaling_driver       : acpi-cpufreq
scaling_avail_gov    : userspace performance powersave ondemand
current_governor     : ondemand
  ondemand specific  :
    sampling_rate    : max [10000000] min [10000] cur [20000]
    up_threshold     : 80
    turbo mode       : enabled
scaling_avail_freq   : 2793000 2660000 2527000 2394000 2261000 2128000
1995000 1862000 1729000 1596000 1463000 1330000 *1197000
scaling frequency    : max [2793000] min [1197000] cur [1197000]

cpu id               : 1
affected_cpus        : 1
cpuinfo frequency    : max [2793000] min [1197000] cur [1197000]
scaling_driver       : acpi-cpufreq
scaling_avail_gov    : userspace performance powersave ondemand
current_governor     : ondemand
  ondemand specific  :
    sampling_rate    : max [10000000] min [10000] cur [20000]
    up_threshold     : 80
    turbo mode       : enabled
scaling_avail_freq   : 2793000 2660000 2527000 2394000 2261000 2128000
1995000 1862000 1729000 1596000 1463000 1330000 *1197000
scaling frequency    : max [2793000] min [1197000] cur [1197000]

[CPU2] failed to get cpufreq parameter
[CPU3] failed to get cpufreq parameter

from "xm dmesg" (attached in the email msg) i noticed these two error lines:

(XEN) cpufreq fail to add CPU2:incorrect _PSD(254:0), expect(254/4)
(XEN) cpufreq fail to add CPU3:incorrect _PSD(254:0), expect(254/4)

does anyone know any solution or tips to address this issue?

thanks,
vinicius

Attachment: dom0-msg.txt
Description: Text document

Attachment: xen-msg.txt
Description: Text document

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