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

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Message-ID: <alpine.DEB.1.10.0905071317270.22107@qirst.com>
Date:	Thu, 7 May 2009 13:18:55 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	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>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] x86: Reduce the default HZ value

On Thu, 7 May 2009, Peter Zijlstra wrote:

> Therefore, decreasing the HZ value to say 50, we'd get a minimum
> involuntary preemption granularity of 20ms, something on the high end of
> barely usable.

But the schedule is activated when a process is being woken up. The main
use is for load balancing.

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