linux-kernel - Re: Default HZ value for X86

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Message-ID: <20090428003454.08d1660c@lxorguk.ukuu.org.uk>
Date:	Tue, 28 Apr 2009 00:34:54 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	akataria@...are.com
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Default HZ value for X86

On Mon, 27 Apr 2009 16:07:10 -0700
Alok Kataria <akataria@...are.com> wrote:

> Hi, 
> 
> I was wondering why do we still have the default HZ value as 1000 for
> the x86 kernels.
> 
> arch/x86/configs/i386_defconfig:CONFIG_HZ=1000
> arch/x86/configs/x86_64_defconfig:CONFIG_HZ=1000
> 
> With the highres timer implementation it was planned to move away from
> relying on high timer interrupt frequency for applications requiring
> precise high resolution timers.

With the tickless kernel does this really matter any more ? We might as
well keep a logical 1000 for convenience and accuracy.

Alan
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