# [OmniOS-discuss] [discuss] illumos power management

Rafael Vanoni rafael.vanoni at pluribusnetworks.com
Fri Nov 15 02:19:03 UTC 2013

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    On Nov 14, 2013, at 17:49, "Paul B. Henson" <henson at acm.org> wrote:

    >> From: randyf at sibernet.com [mailto:randyf at sibernet.com]
    >> Sent: Wednesday, November 13, 2013 10:44 PM
    >>
    >> CPUPM can be independent of autopm, so if you desire CPUPM and not disk
    >> PM, setting autopm to 'disable' is correct (note, autoS3 is only relevant
    >
    > Well, my new draft is:
    >
    > autopm                  disable
    > S3-support              disable
    > cpupm                   enable event-mode
    > cpu_deep_idle           enable
    >
    > Which I think is doing what I want. Unless there is some other component
    > that would be willing to go into power savings mode other than the disks.
    >
    >> Also, you *can* specify different PM capabilities for different disks.
    >> Multi-terabyte drives are cheap, and could serve as the backup media.
    >> There could well be value of having backup disks spindown, but keep the OS
    >> disks always-on (you would have to enable autopm for this action, though).
    >
    > For this box, the only disks are either the production OS or the production
    > storage, but I could see that being useful for some type of online backup
    > box that is only accessed non-interactively once a day or so.
    >
    >> Lastly, powertop(1m) can be used to see how well CPUPM is working for
    >> you.
    >
    > Oooh, cool, I did not realize illumos included powertop. Looks like with the
    > above config on an idle box the majority of CPU time is in C3 and the
    > P-state is exclusively the lowest frequency. I'll have to run that again
    > once I get some load going.
    >
    >
    >> It may be more than you might think.  The backlight on flat panels is
    >> the biggest draw, and may not be trivial.  A monitor rendering black will
    >
    > Oh, it doesn't actually have a monitor attached. The box physically has a
    > VGA port, but the only way I've ever looked at the actual "graphics console"
    > is via the remote KVM app, which I only used when I was initially building
    > it. Serial consoles are much nicer for servers :), the only annoying lack is
    > that there is no way in the supermicro bios to select an alternate boot
    > device via the serial console. You can get into setup, but they haven't
    > mapped anything to pull up the boot menu :(.
    >
    > Thanks much.
    >

    Just out of curiosity, how big is this box (how many sockets/chips and how much memory)?

    Rafael

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