[arch-general] powertop vs archlinux vs ubuntu

[Stefano Z.]

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.
>