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Where is this kernel flag (pcie_aspm) documented? I'm sure it does something, and I just turned it off to get wired Ethernet driver (e1000e) working.

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1 Answer 1

So, the first hit on Google for "pcie_aspm" is:

[patch] pci: document the pcie_aspm kernel parameter

and that documentation is in the current kernel Documentation/kernel-parameters.txt, where it says:

    pcie_aspm=      [PCIE] Forcibly enable or disable PCIe Active State Power
                    Management.
            off     Disable ASPM.
            force   Enable ASPM even on devices that claim not to support it.
                    WARNING: Forcing ASPM on may cause system lockups.

And in turn, google for "pcie active state power management" leads to http://www.intel.com/technology/pciexpress/devnet/docs/PCIExpress1ArchPowerMgmt.pdf, which explans that ASPM does pretty much what the name implies.

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What's the difference between ASPM and ACPI, is this just ACPI for PCIE? –  Evan Carroll Jan 24 '11 at 20:00
    
Is there anyway to turn ASPM for just my Ethernet device? What does ACPI do for PCIe without ASPM.. I'm just wanting to know the practical implications of ASPM, my wired ethernet device is supposed to support different power states.. that sounds awkward.. Is that even possible? –  Evan Carroll Jan 24 '11 at 20:13

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