linux-kernel - Fwd: x86_64 and AMD with C1E

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Message-ID: <b70f2f960710010550i30ae48bu31f137fe46d70611@mail.gmail.com>
Date:	Mon, 1 Oct 2007 16:50:24 +0400
From:	"Mikhail Kshevetskiy" <mikhail.kshevetskiy@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Fwd: x86_64 and AMD with C1E

01 Oct 2007 11:33:48 +0200, Andi Kleen <andi@...stfloor.org>:
>  Mikhail Kshevetskiy <mikhail.kshevetskiy@...il.com> 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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