Messages in this thread | | | Date | Wed, 20 Feb 2008 23:01:19 -0800 (PST) | Subject | kernel-2.6.25-rc2, CPU C state "active state" always remain C0 unchangeable by cat 'proc/' | From | youquan_song@linux ... |
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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@localhost ~]# 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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