Cc: Kok, Auke <auke-jan.h.kok@...>, Greg KH <greg@...>, Arjan van de Ven <arjan@...>, Shaohua Li <shaohua.li@...>, lkml <linux-kernel@...>, linux-pci <linux-pci@...>
did the Kconfig not come with a big fat (EXPERIMENTAL) ?
it actually depends for each device on the PCI-Express bus. Most PCI-E ports
support it but the device has the option of advertising enablement of that
capability or not.
both platform and each device on the pci-e bus are involved. some sata chipsets
work great with it, some that might not even advertise the capability... but it's
really hit and miss.
Your report is great of course, no doubt about it. I hope that people understand
that this feature can seriously break things at the bus level. It makes me feel a
lot better about the issues we had with some of our network cards and ASPM :)
once we get some feeling about how good ASPM works in the field for people we
might have to blacklist certain platforms or devices.
you could (for instance) try to see which device on your busses support ASPM and
work on per-device ASPM parameters (which is one of the things I suggested before)
so that we get an idea of which device is badly behaving with ASPM on your system.
Cheers,
Auke
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