cx_lowest and CPU usage
rpaulo at FreeBSD.org
Sun Mar 9 11:20:41 UTC 2008
Andriy Gapon wrote:
> on 20/02/2008 20:33 Andriy Gapon said the following:
>> on 19/02/2008 23:42 Andriy Gapon said the following:
>>> The last result most probably means that RTC IRQ was not the interrupt
>>> to wake CPU from sleeping state.
>>> The first possibility that comes to mind is that on this particular
>>> hardware RTC interrupt (IRQ8) is not able to wake the system from C2 state.
>> So it seems that this was true.
>> Here's a shortcut to the relevant info:
>> PIIX4E (FW82371EB) specification
>> DEVACTB — DEVICE ACTIVITY B (FUNCTION 3) pci register description
>> BRLD_EN_IRQ8, bit 5
>> $ pciconf -r pci0:0:7:3 0x58
> Attached is a patch that fixes the issue for me (without any
> side-effects) and should not cause any harm for others.
I committed your patch. Thanks!
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