linux-kernel - Re: x86_64 and AMD with C1E

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Message-ID: <20071001070636.2d8e0f9f@laptopd505.fenrus.org>
Date:	Mon, 1 Oct 2007 07:06:36 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Mikhail Kshevetskiy <mikhail.kshevetskiy@...il.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86_64 and AMD with C1E

On Mon, 1 Oct 2007 15:09:53 +0200

> There is normally a threshold above which you don't save significantly
> more power by doing less timer interrupts. You can test this 
> by doing the CONFIG_HZ=100 above.

however the point you're describing tends to more be around 25ms to
50ms.... HZ=100 is only a first rough test (and HZ=100 does have
userspace visibility, multimedia playback suffers due to the decreased
accuracy)
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