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

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Message-Id: <1241717849.6311.1554.camel@laptop>
Date:	Thu, 07 May 2009 19:37:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <cl@...ux.com>
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, 2009-05-07 at 13:18 -0400, Christoph Lameter wrote:
> 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.

Somehow people like involuntary preemption to happen at slightly more
than glacial pace as well.



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