cpufreq=xen is enough to activate cpufreq support on Intel processors with EIST
feature. However you can''t retrieve run-time information by existing
dom0 sysfs interface, as dom0 is also virtualized and there''s no direct
relationship between dom0''s vcpus and underlying physical cpus. By far
hypercall interface is created for such purpose (tools/libxc/xc_pm.c) and you
then can write a small utility to use it. :-)
Thanks,
Kevin
________________________________
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of lagneau@ifrance.com
Sent: 2008年9月8日 16:58
To: xen-users@lists.xensource.com
Subject: [Xen-users] xen 3.3.0 cpufreq usage
Hi,
I want to use cpufreq feature provided by xen 3.3.0 with PV domUs.
My system is a Dell PE1950 with Intel(R) Xeon(R) CPU E5345 with power on demand
activated in bios.
I use hypervisor and dom0 kernel from xen-3.3.0.tar.gz compilated with make
world.
With cpufreq=xen option in grub kernel line i''ve this xm dmesg output
:
(XEN) xen_pminfo: @acpi_cpufreq_cpu_init,HARDWARE addr space
but cat /proc/cpuinfo doesn''t show lower CPU MHz and stepping is
always at his maximum.
I don''t know how to use cpufreq=dom0_kernel because with xen 3.3.0 i
can''t compile my own dom0 kernel with cpufreq support:
In menuconfig if i select Privileged Guest (domain 0) then Cpu frequency
scaling is disabled in Power maangement support.
in anyway i can''t acces through /sys/devices/system/cpu/cpu0/ to
cpufreq.
So how works cpufreq with xen 3.3.0 ?
Is cpufreq=xen only limited to amd processor ?
thanks for answers
Cédric L.
________________________________
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