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SubjectFwd: x86_64 and AMD with C1E
01 Oct 2007 11:33:48 +0200, Andi Kleen <>:
> Mikhail Kshevetskiy <> writes:
> >
> > The same situation can be observed for linux-2.6.22.
> You're saying 2.6.22/x86-64 without any patches doesn't boot out of the box
> with C1E enabled? If yes what are the exact symptoms?
> -Andi

No, it boot and work normally. The only thing i bother, is the
additional 260 timer interrupts per seconds.
Here is short result:

c1e enabled:
-- power consumption about 23 watts
-- there is only C1 power state enabled
-- there are about 260 timer interrupts per seconds
tested with x86_64(2.6.22, 2.6.23-rc8, 2.6.23-rc8-hrt1 ),
i386(2.6.21, 2.6.22, 2.6.23-rc5-hrt1)

c1e disabled:
-- power consumption about 27 watts
-- there are no any power state enabled (including C1)
-- there are no additional 260 timer interrupts per seconds
tested with 2.6.23-rc6-hrt1/x86_64.

I want to reduce the power consumption of my notebook. I see the 2 possibility:
-- remove 260 additional timer interrupts (c1e enabled case )
-- force enable C1, C2 and C3 states (c1e disabled case)
Do you have any idea how it can be reached?

Mikhail Kshevetskiy
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