I'm now running linux-image-2.6.15-26-686, version 2.6.15-26.46 on a
Pentium M 740 1.73MHz (Acer Aspire 1692WLMi).
So far, it seems fine: Without changing max_cstate, CPU rapidly throtles
down to 800MHz and, when idle, CPU usage settles around 5--6%. Starting
new apps, such as opening a firefox window, does not feel sluggish like
it used to.
Here is a sample of data taken some 19 minutes after booting, laptop
connected to AC power, with Wi-Fi on and a USB mouse plugged in:
$ cat /sys/module/processor/parameters/max_cstate
8
$ top
top - 18:56:55 up 14 min, 3 users, load average: 0.08, 0.33, 0.27
Tasks: 103 total, 1 running, 102 sleeping, 0 stopped, 0 zombie
Cpu(s): 5.3% us, 0.0% sy, 0.0% ni, 94.7% id, 0.0% wa, 0.0% hi, 0.0% si
...
$ cat /proc/acpi/processor/CPU*/power
active state: C2
max_cstate: C8
bus master activity: 04004002
states:
C1: type[C1] promotion[C2] demotion[--] latency[000]
usage[00000010]
*C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00356747]
C3: type[C3] promotion[C4] demotion[C2] latency[085]
usage[00053269]
C4: type[C3] promotion[--] demotion[C3] latency[185]
usage[00065042]
Looks like this one is fixed. Thanks.
--
cpu idle time in /proc/stat wrong
https://launchpad.net/bugs/30557
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