vt(4) not power friendly? (was: High CPU temperature and high fans level)
Aleksandr Rybalko
ray at ddteam.net
Thu Sep 8 22:11:07 UTC 2016
Hi guys!
IIRC, it check for updates 25Hz, but not redraw whole screen.
Full screen update looks really ugly :)
2016-09-06 21:09 GMT+03:00 Lundberg, Johannes <
johannes at brilliantservice.co.jp>:
> Ok, so it seems hw.vga.textmode has no effect on UEFI only systems,
> correct? At least, I couldn't tell any difference between text and graphics
> mode on Intel Cherryview...
>
> Doing this on an older traditional BIOS laptop gives at idle console login
> prompt:
>
> textmode i915kms not loaded 10.1W
> graphics mode i915kms not loaded 10.2W
> i915kms loaded 9.2W
>
> Refreshing screen contents by doing "ls" 10 times / second with alternating
> folders.
>
> textmode 10.3W
> graphicsmode 10.5W
> i915kms 10.8W
>
> Measured with acpiconf -i 0 (charger disconnected).
> Numbers are average over several measurements.
>
> At one time "textmode i915kms not loaded" did show 9.3W so it's difficult
> to say if there really is a difference between text and graphics mode.
> However, there's a clear difference between i915kms loaded vs not loaded.
> Not so big that the fans start to go high though...
>
>
> Conclusion:
>
> According to these tests maybe it's not a big deal for the average user who
> loads X or works in console but considering all the servers out there
> idling at the console prompt there's a lot of wasted energy....
>
> I haven't looked into it that much but it seems that vt is forcing screen
> refresh at 25 Hz. Might be a good idea to do a more event driven rendering
> and postpone melting the ice caps a little longer :)
>
>
> On Thu, Sep 1, 2016 at 3:21 PM, Lundberg, Johannes <
> johannes at brilliantservice.co.jp> wrote:
>
> > Adding
> > hw.vga.textmode=1
> > to /boot/loader.conf does not make any difference.
> >
> > On Sun, Aug 28, 2016 at 7:03 PM, Adrian Chadd <adrian.chadd at gmail.com>
> > wrote:
> >
> >> 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
> >> >> _______________________________________________
> >> >> freebsd-x11 at freebsd.org mailing list
> >> >> https://lists.freebsd.org/mailman/listinfo/freebsd-x11
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> freebsd.org"
> >> >>
> >> >
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--
WBW
-------
Rybalko Aleksandr <ray at ddteam.net>
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