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

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Message-ID: <alpine.DEB.1.10.0905071404390.22107@qirst.com>
Date:	Thu, 7 May 2009 14:12:15 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	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>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] x86: Reduce the default HZ value

To get back to the main point: I agree with Alok that the default HZ needs
to be as low as possible. The remaining justification is the load
balancing and possible context switching between multiple tasks contenting
for a processor.

Is it enough if this occurs 100 times per second?

If so then we should change the default in kernel/Kconfig.hz.

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