linux-kernel - Re: [PATCH] correct inconsistent ntp interval/tick

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Message-ID: <Pine.LNX.4.64.0801310251090.17507@scrub.home>
Date:	Thu, 31 Jan 2008 02:55:35 +0100 (CET)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	john stultz <johnstul@...ibm.com>
cc:	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] correct inconsistent ntp interval/tick_length usage

Hi,

On Tue, 29 Jan 2008, john stultz wrote:

> +/* Because using NSEC_PER_SEC would be too easy */
> +#define NTP_INTERVAL_LENGTH ((((s64)TICK_USEC*NSEC_PER_USEC*USER_HZ)+CLOCK_TICK_ADJUST)/NTP_INTERVAL_FREQ)

Why are you using USER_HZ? Did you test this with HZ!=100?
Anyway, please don't make more complicated than it already is.
What I said previously about the update interval is still valid, so the 
correct solution is to use the simpler NTP_INTERVAL_LENGTH calculation 
from my last mail and to omit the correction for NO_HZ.

bye, Roman
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