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Date: Wed, 20 Feb 2008 23:01:19 -0800 (PST)
From: youquan_song@...ux.intel.com
To: linux-kernel@...r.kernel.org
Cc: youquan.song@...el.com
Subject: kernel-2.6.25-rc2,
CPU C state "active state" always remain C0 unchangeable by cat
'proc/'
On Fedora9 Alpha with kernel-2.6.25-rc2,
I run " watch -n 0.1 "cat /proc/acpi/processor/CPU*/power | grep 'active
state'" ", I find that the CPU C state information "active state" remain
at "C0" and it do not change any time. The same issue also exit on
2.6.24-rc2 kernel.
But with RHEL5.1 kernel-2.6.18 the CPU C state information is normal.
Every 0.1s: cat /proc/acpi/processor/CPU*/power | grep 'active state'
Thu Feb 21 09:44:33 2008
active state: C0
active state: C0
active state: C0
active state: C0
active state: C0
active state: C0
active state: C0
active state: C0
On RHEL5.1 kernel-2.6.18-53.el5
[root@...alhost ~]# cat /proc/acpi/processor/CPU*/power | grep 'active state'
active state: C2
active state: C2
active state: C2
active state: C2
active state: C2
active state: C3
active state: C2
active state: C3
The hardware platform: bensley and santarosa.
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