Active State Power Management (ASPM)/Aggressive Link Power Management (ALPM)

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Active State Power Management (ASPM) and Aggressive Link Power Management (ALPM) are power management features that are used to reduce power consumption in the PCI Express (PCIe) interface.

ASPM is a power management standard that is defined by the PCI-SIG (PCI Special Interest Group), the organization that manages the PCIe specification. ASPM allows for dynamic power management of the PCIe link between the processor and a device, such as a network controller or storage device. This can help to reduce power consumption when the link is idle or not in use.

ALPM, on the other hand, is a more aggressive power management feature that is available on some storage devices, such as solid-state drives (SSDs). ALPM allows the storage device to enter a deeper power-saving state, which can reduce power consumption even further than ASPM.

Together, ASPM and ALPM can help to significantly reduce power consumption in the PCIe interface, which can help to extend battery life in portable devices and reduce energy costs in enterprise systems.