On 12-02-12 23:57, Michael Lampe wrote:
> After going from CentOS 5.7 to 6.2, a lot of things turned out to be
> much better, but there are also quite some regressions. The most obvious
> one is power consumption on my notebook. It was notably lower before.
>
> The ASPM issue introduced in 2.6.38 was widely reported and discussed,
> and the 6.2 kernel has exacatly this code as a backport.
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2f671e2dbff6eb5ef4e2600adbec550c13b8fe72
>
>
> So I started to experiment with the upstream patch:
>
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commitdiff;h=3c076351c4027a56d5005a39a0b518a4ba393ce2;hp=69166fbf02c7a21745013f2de037bf7af26e4279
>
>
> To make it apply, one needs to change 'pci_is_pcie(pdev)' into
> 'pdev->is_pcie'. One also needs to fiddle a little with the first chunk.
>
> I came up with the patch attached, but unfortunately the new kernel
> showed no improvement. Most probably I got something wrong.
>
> Anyone else here who tried this or is interested in sorting this out?
Iirc to enable ASPM on Fedora the kernel must be booted with
pcie_aspm=force. Maybe you need to use that option too? For more info
see:
http://www.phoronix.com/scan.php?page=article&item=linux_aspm_solution&num=1
Regards,
Patrick
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