[arch-general] powertop vs archlinux vs ubuntu

[Stefano Z.]

seems this is my same problem:

http://bugs.archlinux.org/task/17771

On Mon, Feb 22, 2010 at 10:42 AM, Stefano Z. <mie.iscrizioni at gmail.com> wrote:
> nothing, the problem still exist, also with i915.modeset=0.
>
> On Mon, Feb 22, 2010 at 11:30 AM, Andrea Fagiani <andfagiani at gmail.com> wrote:
>> On 02/22/2010 09:04 AM, Stefano Z. wrote:
>>>
>>> no, my dual celeron su2300 dosen't support speedstep, it stay fixed to
>>> 1.2ghz
>>> but i have found the problem, i think this problem have to do with KMS...
>>> I have istalled kernel26 2.6.31.6-1 and the problem disappered but
>>> obviously
>>> this is not the solution i want ;-)
>>> If i install 2.6.32+ kernel the problem reappear.
>>> Another thing that happens is that the cpu(s) Temperature with kernels
>>>
>>>>
>>>> 2.6.31 stay
>>>>
>>>
>>> about on 53+C while with kernel<2.6.32 stays on 42C...
>>>
>>>
>>>
>>> On Mon, Feb 22, 2010 at 9:43 AM, Andrea Fagiani<andfagiani at gmail.com>
>>>  wrote:
>>>
>>>>
>>>> On 02/22/2010 04:53 AM, Brendan Long wrote:
>>>>
>>>>>
>>>>> On 02/21/2010 04:55 PM, Xavier Chantry wrote:
>>>>>
>>>>>
>>>>>>
>>>>>> On Mon, Feb 22, 2010 at 12:42 AM, Stefano Z.<mie.iscrizioni at gmail.com>
>>>>>>  wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> hi
>>>>>>>
>>>>>>> i've bought a new notebook (hp pavilion dm1-1150sl) and installed
>>>>>>> archlinux.
>>>>>>> i have see a strange thing with powertop, i'm running the vanilla arch
>>>>>>> kernel26,
>>>>>>> and i have see this behaviour:
>>>>>>> Cn                Avg residency       P-states (frequencies)
>>>>>>> C0 (cpu occupata)      (31,6%)
>>>>>>> C0                0,0ms ( 0,0%)
>>>>>>> C1 mwait          0,1ms ( 0,7%)
>>>>>>> C4 mwait          0,0ms (67,8%)
>>>>>>> Wakeups-from-idle per second : 31483,5  interval: 10,0s
>>>>>>> ---
>>>>>>> as you can see, i have a LOT of wakeups per seconds very low c1 states
>>>>>>> lot of c0 and c4 states,
>>>>>>> a wattmeter tell me that archlinux consume about 25/26watt
>>>>>>> Then i have boot a live ubuntu distro and see this:
>>>>>>> Cn                permanenza media    P-state (frequenze)
>>>>>>> C0 (cpu occupata)      ( 0,6%)
>>>>>>> polling           0,0 ms ( 0,0%)
>>>>>>> C1 mwait         26,7 ms (68,6%)
>>>>>>> C4 mwait          1,2 ms (30,8%)
>>>>>>> Wakeup-da-idle al secondo: 281,3        intervallo: 15,0s
>>>>>>> ---
>>>>>>> as you can see  the wakeups are a LOT lower than on arch and we have
>>>>>>> lot of c1 and c4 state,
>>>>>>> power consumption is about 20W, the same that i have with win7 (about
>>>>>>> 18/20w).
>>>>>>> For meaning about cX state see here:
>>>>>>> http://www.lesswatts.org/projects/powertop/powertop.php
>>>>>>>
>>>>>>> thanks!
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> You didn't give enough information so we will need to check the basis :
>>>>>> - which cpufreq driver and governor are you using in both cases (check
>>>>>> cpufreq-info)
>>>>>> - what processes does powertop show as causes for wakeups ?
>>>>>> - what processes does top show in term of cpu usage ?
>>>>>>
>>>>>> Here is what I got in the last few minutes when i was writing this :
>>>>>> C4 mwait          3.4ms (92.5%)          800 Mhz    98.0%
>>>>>> Wakeups-from-idle per second : 279.4    interval: 10.0s
>>>>>>
>>>>>> I have a core 2 duo with acpi-cpufreq loaded and conservative governor.
>>>>>> $ grep cpufreq /etc/rc.conf
>>>>>> MODULES=(acpi-cpufreq)
>>>>>> DAEMONS=(syslog-ng net-profiles crond dbus hal alsa cpufreq
>>>>>> storage-fixup)
>>>>>> $ grep governor /etc/conf.d/cpufreq
>>>>>> # valid governors:
>>>>>> governor="conservative"
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> They may just not have cpu-freq-utils installed maybe? I'm using
>>>>> laptop-mode-tools with compiz and GNOME running (but not doing anything)
>>>>> and it's saying 99.2% C4, 0.8% C0. This is with another Core2 and
>>>>> laptop-mode is set to use the powersave governor on battery (which is
>>>>> how I tested). When I plug it in, it jumps up to 25%, but I don't really
>>>>> care how active the processor is when it's on battery.
>>>>>
>>>>>
>>>>>
>>>>
>>>> Be sure to have cpu-freq-utils installed, as well as loading the right
>>>> modules (acpi-cpufreq, cpufreq_ondemand, if you plan on using the same
>>>> governor as ubuntu does), and add `cpufreq` to your DAEMONS array in
>>>> rc.conf.
>>>> On my system, with laptop-mode-tools the powertop output is very similar
>>>> to
>>>> what Brendan said. Also, the 31k+ wakeups definitely mean there's some
>>>> issue
>>>> on your config.
>>>>
>>>>
>>>
>>>
>>
>> If you think it's KMS causing problems, try adding `nomodeset` to your
>> kernel boot line and see what happens.
>>
>