From: "Ulrich Windl" <ulrich.windl@rz.uni-regensburg.de>
Organization: Universitaet Regensburg, Klinikum
To: Roman Zippel <zippel@linux-m68k.org>
Date: Wed, 15 Feb 2006 08:26:05 +0100
MIME-Version: 1.0
Subject: Re: time patches by Roman Zippel
Cc: linux-kernel@vger.kernel.org
Message-ID: <43F2E59D.24184.A70C2D5@Ulrich.Windl.rkdvmks1.ngate.uni-regensburg.de>
In-reply-to: <Pine.LNX.4.61.0602141515500.30994@scrub.home>
References: <43F1F2B4.7205.6BBE301@Ulrich.Windl.rkdvmks1.ngate.uni-regensburg.de>
Content-type: text/plain; charset=ISO-8859-1
Content-transfer-encoding: 8BIT
Content-description: Mail message body
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 889
Lines: 27

On 14 Feb 2006 at 15:33, Roman Zippel wrote:

[...]
> > Assuming 1024Hz interrupt frequency:
> > (1?s * 1000) / 1024 == 0ns; 0 * 1024 == 0?s, not 1?s
> > (2?s * 1000) / 1024 == 1ns; 1 * 1024 == 1.024?s, not 2?s
> 
> Ok, I didn't put much effort into optimizing it for uncommon HZ values. 
> Why is it so important? It's currently unused on any Linux machine 
> synchronized via NTP.

Roman,

how do you know? When using "disable kernel", NTP relies on adjtime() to adjust 
the time. Some people even prefer that, because the algorithms do floating point 
math in user space instead of fixed-point maths in kernel space.

[...]

Regards,
Ulrich

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/