linux-kernel - Re: Higer latency with dynamic tick (need for an io-ondemand govenor?)

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Message-ID: <480B5299.9090904@firstfloor.org>
Date:	Sun, 20 Apr 2008 16:26:33 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Woodruff, Richard" <r-woodruff2@...com>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	lenb@...nel.org
Subject: Re: Higer latency with dynamic tick (need for an io-ondemand govenor?)

Woodruff, Richard wrote:
> "Andi Kleen" <andi@...stfloor.org> writes:
>> Are you talking about x86?
> 
> ARM (TI-OMAP)

Sorry I was confused because you used the term "C-state" which is normally ACPI (x86/ia64) 
specific. If someone says C states I assume ACPI and usually x86 by default
due to lack of deeper sleep states on most ia64s.

> Not sure about the underlying X86 hardware implementation.

On x86 the trend is for the hardware/firmware/SMM doing more and more of this on its own,
as in deciding by itself how deep it wants to sleep.

-Andi
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