linux-kernel - Re: [PATCH] x86: Reduce the default HZ value

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Date:	Thu, 7 May 2009 15:56:46 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Alok Kataria <akataria@...are.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Reduce the default HZ value

On Thu, 7 May 2009, Alan Cox wrote:

> Even then its pointlessly jumping up and down and changing stuff rather
> than fixing the real problem - which is jiffies.

Reducing the number of application interruptions by a factor of 10 is not
pointless. The lower HZ becomes the more useless it will become for the
users of jiffies because they will have to create timers and use time
intervals if the HZ intervals become too large.

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