linux-kernel - Re: [PATCH] Track accurate idle time with tick_sched.idle

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Message-ID: <20070902100215.GB26138@elte.hu>
Date:	Sun, 2 Sep 2007 12:02:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Track accurate idle time with tick_sched.idle_sleeptime


* Andi Kleen <andi@...stfloor.org> wrote:

> > at least the current out-of-idle code already does what amounts to a 
> > PM-timer read when exiting from C2 or C3 mode. The
> 
> C2/C3 are already slow. I more worry about C1.

C2/C3 are only slow in older CPUs - and they are getting faster and 
faster. (also, newer systems do less of C1, due to increased energy 
awareness.)

would be nice to measure the overhead/impact i suspect.

	Ingo
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