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Linux 3.9 Still Toying With PCI-E ASPM, Hot-Plugging

Linux Kernel

Published on 24 February 2013 09:48 AM EST
Written by Michael Larabel in Linux Kernel
6 Comments

The PCI pull request for the Linux 3.9 kernel reveals that more hot-plugging work is about to land plus developers are still working on the handling of PCI Express ASPM (Active State Power Management), the cause of the major Linux kernel power regression of 2011.

Bjorn Helgaas sent in the PCI changes for Linux 3.9 on Saturday afternoon. PCI changes for this next kernel include improved major work on host bridge hot-plug with overhauling PCI/ACPI binding, ACPI host-bridge add/start, and other areas. PCI device hot-plugging also saw changes plus there were various other random changes to the Linux PCI sub-system.

When it comes to PCI power management on Linux 3.9, PCI Express Active State Power Management (PCI-E ASPM) will now not be touched by the kernel if it's disabled. There's also a reported fix to the ASPM link state management.

More details on the PCI subsystem changes for the Linux 3.9 kernel can be found from Bjorn's pull request.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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