• [6.9.2] Unable to enable ASPM: it stays disabled even with policy and boot option (Ubuntu works, Unraid not)

    Falcosc

    By Falcosc

      • Minor

    Steps to reproduce:

    1. correctly configure bios to support ASPM
    2. Don't install any unnecessary components, no hard drives connected, no add-in cards installed
    3. boot a fresh Ubuntu 21.04 from USB
    4. check if ASPM is enabled 
      lspci -vvvnnPPDq

      lspci_ubuntu.txt

    5. boot Unraid 6.9.2
    6. check if ASPM is enabled 
      lspci -vvvnnPPDq

      lspci_unraid.txt

    7. try to fix it with 

      echo -n powersave > /sys/module/pcie_aspm/parameters/policy

       

    8. try to fix it with boot option
      add pcie_aspm=force to /boot/syslinux/syslinux.cfg
    9. reboot
    10. check if ASPM is enabled
      lspci_unraid_aspm.txt
    11. try to fix it with 
      echo -n powersave > /sys/module/pcie_aspm/parameters/policy
powertop --auto-tune
    12. veryfy if boot option was used pcie_aspm=force
      unraid_aspm_syslog.txt

     

    Expected Result:

    ASPM should be enabled like it is in Ubuntu to save 4W of power in idle

     

    Actual Result:

    It is still disabled

    lspci_unraid_aspm.txt

     

    What setting or which driver could prevent ASPM or does disable ASPM? I don't know how to compare Ubuntu with Unraid to check what is different.

     

    Workarround:

    I know that Unraid and my hardware is capable of enable ASPM. Not only because Ubuntu does it, but because I can force it with manually setting it in the register https://wireless.wiki.kernel.org/en/users/documentation/aspm#enabling_aspm_with_setpci

    After doing this hack for my root and ethernet interface, the power consumption gets reduced by 4W and powertop does tell that my CPU Package does now reach C7 instead of C2

     

    Hardware Infos

    server-diagnostics-20210727-1604.zip

     

    About Me

    I don't know if this error did exist in the previous versions because I'm currently evaluating Unraid and would like to know how important power saving issues are for you because I want to use it to make it more easy to reduce my servers power consumption. Power is expensive at my location, I can easily afford server upgrades based on power savings.
    I would like to give the money to you for a license instead to my power provider :)

     

    • Like 1
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    Falcosc

    I did repeat the test with

    Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)

    And it does support ASPM by default as well without doing anything.

    • Like 1
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  • Status Definitions

     

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