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

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Date:	Tue, 05 May 2009 14:21:34 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	akataria@...are.com
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH] x86: Reduce the default HZ value

Alok Kataria wrote:
> Hi,
> 
> Given that there were no major objections that came up regarding
> reducing the HZ value in http://lkml.org/lkml/2009/4/27/499. 
> 
> Below is the patch which actually reduces it, please consider for tip.
> 

What is the benefit of this?

I can see at least one immediate downside: some timeout values in the 
kernel are still maintained in units of HZ (like poll, I believe), and 
so with a lower HZ value we'll have higher roundoff errors.

	-hpa
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