-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 5/17/2013 4:24 PM, Bjorn Helgaas wrote: > Oh, wait a minute... You mentioned the radeon driver. The Radeon > device in your system is at 01:00.0, and that is below the 00:01.0 > bridge that said "ASPM unknown." If the bridge leading to the > Radeon device doesn't support ASPM, then of course, we won't be > able to turn on ASPM for it. That's what I was asking about before when I said surely the bridge higher up doesn't have to have aspm enabled in order to enable it on the downstream link? > That doesn't explain why we don't turn on ASPM for the *other* > devices (03:00.0, 05:00.0, 06:00.0, 09:00.0) though. 00:01.0 says it is the root complex, so wouldn't that make it upstream of *everything*? As I understand it, the root complex is built into the CPU and has 16 lanes going to the video slot, and another 4 lanes running at gen3 speed that Intel calls the DMI that goes to the PCH, which has some internal functions, and bridges to another 20 pcie lanes. Since the root complex is built into the cpu, I wouldn't think ASPM could possibly make sense on it, so it showing that it doesn't support ASPM makes sense to me. That doesn't seem like it should preclude using ASPM on the link down to the video card. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJRlp0wAAoJEJrBOlT6nu7543QIAMfU7GnhweyxmunYl8fKq0B9 KCX3PSQaXXmknKxKtSDPtI3BhuTN+5g9KjXX+tDngETRPwq/5ZRXhIAcNjQCpv0d K5Io/1vh652Aa0eVm1Yae+ejBWB/hWSu/AM/U0L1wyWGqat53QwfSHlMcQOFeuxq oHoRrE5JtmcSbRbWtXFsOgRx5iXkgMzcwDxZ93Z4djhWjYGX+pGSk0DOTlttG/AP RyT+oKYs8BmCytk/9/PFE0v/CtaAiNjEL42WAgv3nJMNuezG/CiBeUi7q9+vqKE8 1r+kGTbenKeEkboROWHXN/JCq3IsKCkff6rQC/s+oXBdORpCw46PcwpBno5kK+Q= =sZdM -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
