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

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Message-ID: <20090507161232.6e33df34@lxorguk.ukuu.org.uk>
Date:	Thu, 7 May 2009 16:12:32 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Lameter <cl@...ux.com>
Cc:	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 10:09:56 -0400 (EDT)
Christoph Lameter <cl@...ux.com> wrote:

> On Tue, 5 May 2009, Alan Cox wrote:
> 
> > HZ on a tickless system has no meaningful relationship to wakup rates -
> > which are what I assume you actually care about.
> 
> Linux is not tickless. It only switches off ticks if a processor is idle.

Hooray - finally someone admits the *real* problem here, and for power
management too. Otherwise known as "referencing jiffies as a variable must
die"

Alan
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