vt(4) not power friendly? (was: High CPU temperature and high fans level)
Adrian Chadd
adrian.chadd at gmail.com
Mon Aug 29 02:03:02 UTC 2016
On 18 August 2016 at 16:18, Lundberg, Johannes
<johannes at brilliantservice.co.jp> wrote:
> Hi
>
> I have been wondering about the same. I have a watt meter connected to my
> dev board and I can clearly see power consumption going down when VT is
> inactive.
>
> We should look into this.
... interesting. Hm. Can you boot vt into 80x25 text mode and test?
-a
>
> On Thu, Aug 18, 2016 at 2:44 PM, David Demelier <demelier.david at gmail.com>
> wrote:
>
>> On 20/07/16 15:20, Ian Smith wrote:
>>
>>> On Wed, 20 Jul 2016 12:46:32 +0200, David Demelier wrote:
>>> > Le 18/07/2016 15:41, Ian Smith a écrit :
>>> > > In freebsd-questions Digest, Vol 632, Issue 8, Message: 21
>>> > > On Sun, 17 Jul 2016 11:59:32 +0200 David Demelier
>>> > > <demelier.david at gmail.com> wrote:
>>> > > > 2016-07-17 0:25 GMT+02:00 Polytropon <freebsd at edvax.de>:
>>> > > > > On Sun, 17 Jul 2016 00:06:07 +0200, David Demelier wrote:
>>> > > > >> Hello,
>>> > > > >>
>>> > > > >> I was trying FreeBSD 10.3 on my laptop (hp probook 4510s)
>>> and was surprised
>>> > > > >> to see high CPU temperature and fans running high.
>>> > > > >>
>>> > > > >> No apps running, I get a temperature of 57C in
>>> dev.cpu.x.temperature and
>>> > > > >> fans run high (not able to get rpms).
>>> > > > >>
>>> > > > >> On a 4.6.3 Linux distro I get an average of 48C and fans are
>>> quite low.
>>> > > > >>
>>> > > > >> Both tests were kept in tty. No Xorg running just a boot and
>>> user login in
>>> > > > >> console.
>>> > > > >>
>>> > > > >> Do you have any clue?
>>> > > > >
>>> > > > > Did you enable powerd? It can slow down the CPU when the
>>> system
>>> > > > > is idle, and increase the CPU speed when needed. This should
>>> have
>>> > > > > an effect on CPU temperature and fan speed.
>>> > >
>>> > > > Yes, I had powerd enabled, I tried -a adaptive, -a hiadaptive as
>>> > > > suggested by Erich but it seems that only -a min has some little
>>> > > > effect. I could get a temperature of 52C. I've tested back on
>>> Linux
>>> > > > and I got an average much lower (41C).
>>> > >
>>> > > We really need to see what speed the CPU is running at when idle.
>>> > >
>>> > > I think the fans running high - presumably from the sound and
>>> airflow? -
>>> > > rules out the sort of sensor errors Arthur reported (ie below
>>> ambient :)
>>> > > and I assume the box actually feels warmer .. 57C suggests a busy
>>> CPU or
>>> > > two .. but then it is summer there; what background ambient temp.
>>> range?
>>> >
>>> > We have air-conditioning at work so ambient temperature is normal,
>>> somewhat
>>> > between 24-28.
>>>
>>> Ok, just checking. So the temperatures are indeed obviously excessive.
>>>
>>> > > > By the way the other sensors in hw.acpi.tz* are also much
>>> higher than
>>> > > > Linux (using lm_sensors). The highest value is my tz5 which is
>>> at 78C
>>>
>>> Isn't that tz2? tz5 is only 55C in your listing (and not active), but
>>> tz2 is indeed 78C and working the fan moderately hard.
>>>
>>> > > > almost 5 seconds after boot while the maximum tz value in Linux
>>> > > > sensors is 55.
>>> > > >
>>> > > > I have no idea what's wrong. :(
>>>
>>> > > % sysctl hw.acpi
>>> > > % sysctl debug.acpi
>>> > > % sysctl dev.est # assuming intel? if not, maybe
>>> dev.hwpstate?
>>> > > % sysctl dev.cpu # best while idle, maybe plus when busier
>>>
>>> > Thanks for your answer, here I posted the output of the sysctl
>>> variables you
>>> > asked for:
>>> >
>>> > http://markand.fr/files/result.txt
>>>
>>> Thanks, that's a useful format. Well, a couple of things ..
>>>
>>> > I've ran them on a FreeBSD memstick, I needed to install a Linux
>>> distro until
>>> > I can find a solution because this drains my battery a lot.
>>>
>>> But did you start powerd after the memstick boot? From the CPU speed,
>>> assuming it was generally idle, I suspect not?
>>>
>>> The big surprise is that CPU frequency (at least when you asked) is at
>>> maximum (except for Turboboost mode) and that it's only using C1 state
>>> when halted. C2 and C3 states provide a huge win for power consumption
>>> - and so proportionally less heat. Alexander takes it to the limit at:
>>> https://wiki.freebsd.org/TuningPowerConsumption
>>>
>>> hw.acpi.cpu.cx_lowest: C1 # the 'master setting' for cx_lowest
>>>
>>> # ==> sysctl dev.cpu
>>> dev.cpu.1.cx_usage: 100.00% 0.00% 0.00% last 14427us
>>> dev.cpu.1.cx_lowest: C1
>>> dev.cpu.1.cx_supported: C1/1/1 C2/2/1 C3/3/162
>>> [..]
>>> dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 13756us
>>> dev.cpu.0.cx_lowest: C1
>>> dev.cpu.0.cx_supported: C1/1/1 C2/2/1 C3/3/162
>>> dev.cpu.0.freq_levels: 2101/35000 2100/35000 1600/23888 1200/15000
>>> dev.cpu.0.freq: 2100
>>>
>>> Also noted that it's running on battery (which is good for this purpose)
>>> hw.acpi.acline: 0
>>> hw.acpi.battery.info_expire: 5
>>> hw.acpi.battery.units: 1
>>> hw.acpi.battery.state: 1
>>> hw.acpi.battery.time: 91 # can likely be doubled of better
>>> hw.acpi.battery.life: 79
>>>
>>> > The average temperature was 50C, a bit less than the installed
>>> version on
>>> > hard drive where I have seen higher values. This is interesting. I
>>> will
>>> > double check if something else makes the CPU more busy.
>>>
>>> Well you need to duplicate basic conditions when booted from memstick;
>>> after boot, as root you should be able to:
>>>
>>> # service powerd onestart
>>> # sysctl hw.acpi.cpu.cx_lowest=Cmax
>>>
>>> and then observe dev.cpu.0.freq and dev.cpu.0.cx_usage ..
>>>
>>> Though whenever you plug it in, or unplug it, you'll have to set the
>>> sysctl again, unless you update the settings in /etc/rc.conf (possible?)
>>>
>>> Which should a) have it drop back to 1200 MHz and b) allow it to use C2
>>> and probably C3 .. you might check dmesg for any mention of 'C2' or 'C3'
>>> as certain combinations of chosen timecounter can limit C3 or even C2
>>> use, and will say so (usually to do with use of the TSC as timecounter)
>>>
>>> On 9.3 one still had to explicily set these:
>>> !grep cx /etc/defaults/rc.conf
>>> performance_cx_lowest="HIGH" # Online CPU idle state
>>> economy_cx_lowest="HIGH" # Offline CPU idle state
>>> !grep cx /etc/rc.conf
>>> performance_cx_lowest=C3
>>> economy_cx_lowest=C3
>>>
>>> But on head sources from a couple of months ago:
>>> !grep cx /usr/head/src/etc/defaults/rc.conf
>>> performance_cx_lowest="C2" # Online CPU idle state
>>> economy_cx_lowest="Cmax" # Offline CPU idle state
>>>
>>> So you might want to check what is there for 10.3? Setting both 'Cmax'
>>> (or at least to C2) should be safe, the head defaults above are likely
>>> more conservative for a few boxes that aren't happy with C3 and higher.
>>>
>>> If that works, with powerd running CPU at 1200 MHz, it should save lots
>>> of power and run plenty cooler. Good luck!
>>>
>>> Warner Losh has suggested disabling Turbo mode on these if having heat
>>> problems, by adding (in your case) '-M 2100' to powerd_flags, but that
>>> might be something for later. Meanwhile go for C2 and C3+ if possible.
>>>
>>> As for fans, tz2 and tz0 are the only ones with 'active' cooling, though
>>> tz2 is the only one also with passive cooling, so is most probably the
>>> CPU/s - see acpi_thermal(4).
>>>
>>> This one doesn't turn on passive cooling (ie slowing the CPU) until only
>>> 3C below critical shutdown temperature, which seems a bit close to me.
>>>
>>> At that moment it was above 45C and below 62C, so running at level 3.
>>>
>>> hw.acpi.thermal.tz2._TSP: 300
>>> hw.acpi.thermal.tz2._TC2: 2
>>> hw.acpi.thermal.tz2._TC1: 1
>>> hw.acpi.thermal.tz2._ACx: 84.0C 74.0C 62.0C 45.0C 38.0C 30.0C -1 -1 -1 -1
>>> hw.acpi.thermal.tz2._CRT: 108.0C
>>> hw.acpi.thermal.tz2._HOT: -1
>>> hw.acpi.thermal.tz2._PSV: 105.0C
>>> hw.acpi.thermal.tz2.thermal_flags: 0
>>> hw.acpi.thermal.tz2.passive_cooling: 1
>>> hw.acpi.thermal.tz2.active: 3
>>> hw.acpi.thermal.tz2.temperature: 53.0C
>>>
>>> This fan is also active at level 3 (0-based, so above 72C, with 3 higher
>>> speeds to go). It can be hard to tell what TZ matches what 'device'.
>>>
>>> hw.acpi.thermal.tz0._TSP: -1
>>> hw.acpi.thermal.tz0._TC2: -1
>>> hw.acpi.thermal.tz0._TC1: -1
>>> hw.acpi.thermal.tz0._ACx: 105.0C 96.0C 87.0C 72.0C 64.0C 57.0C 30.0C -1
>>> -1 -1
>>> hw.acpi.thermal.tz0._CRT: 108.0C
>>> hw.acpi.thermal.tz0._HOT: -1
>>> hw.acpi.thermal.tz0._PSV: -1
>>> hw.acpi.thermal.tz0.thermal_flags: 0
>>> hw.acpi.thermal.tz0.passive_cooling: 0
>>> hw.acpi.thermal.tz0.active: 3
>>> hw.acpi.thermal.tz0.temperature: 78.0C
>>>
>>> That one seems pretty high. I'd suspect the GPU(/s?) but you're not
>>> running X, so hmmm .. definitely not CPU though.
>>>
>>> cheers, Ian
>>>
>>
>> Hello all,
>>
>> Sorry for this late response, I was in vacation.
>>
>> I've spent some time into this problem again, and I think I have found the
>> culprit. I first disabled completely the new console driver vt(4) to use
>> the old syscons and the CPU coretemp temperature immediately fell.
>>
>> Running with vt(4) and radeonkms loaded: average of 47°, no X, just a
>> plain tty with nothing running.
>>
>> Running with syscons: average of 38°.
>>
>> That's why I've CC'ed to freebsd-x11@,
>>
>> Is there power issue in the new vt(4) driver? I've also tried with
>> textmode with the same results.
>>
>> Regards,
>>
>> --
>> David Demelier
>> _______________________________________________
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