linux-kernel - Re: Fwd: x86_64 and AMD with C1E

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Date:	Mon, 1 Oct 2007 16:14:45 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mikhail Kshevetskiy <mikhail.kshevetskiy@...il.com>
cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: Fwd: x86_64 and AMD with C1E

On Mon, 1 Oct 2007, Mikhail Kshevetskiy wrote:
> 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 )

There is work in progress on a patch, which allows to utilize the hpet
timers as per cpu timers. This should solve the problem. Be patient.

Thanks,

	tglx
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