Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754900AbZFBAHJ (ORCPT ); Mon, 1 Jun 2009 20:07:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754283AbZFBAG7 (ORCPT ); Mon, 1 Jun 2009 20:06:59 -0400 Received: from mx2.redhat.com ([66.187.237.31]:55641 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754207AbZFBAG6 (ORCPT ); Mon, 1 Jun 2009 20:06:58 -0400 Message-ID: <4A246D0B.40204@redhat.com> Date: Mon, 01 Jun 2009 20:06:35 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 2.0.0.17 (X11/20080915) MIME-Version: 1.0 To: John Stultz CC: Ingo Molnar , mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, tglx@linutronix.de, linux-tip-commits@vger.kernel.org, Miroslav Lichvar Subject: Re: [tip:timers/ntp] ntp: adjust SHIFT_PLL to improve NTP convergence References: <200905051956.n45JuVo9025575@imap1.linux-foundation.org> <1243542817.29511.523.camel@jstultz-laptop> <20090601232223.GH749@elte.hu> <1243900716.11263.42.camel@jstultz-laptop> In-Reply-To: <1243900716.11263.42.camel@jstultz-laptop> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1181 Lines: 27 John Stultz wrote: > On Tue, 2009-06-02 at 01:22 +0200, Ingo Molnar wrote: >> I might be missing something here - but Linux converging faster >> seems like a genuinely good thing. What non-Linux problem could >> there be? Linux's convergence is really Linux's private issue. > > Yea. It does seem that way. Miroslav can likely expand on the issue to > help clarify, but as I understand it, the example is if you have a > number of systems that are peers in an NTP network. All of them are > using the same userland NTP daemon. However, if the rate of change that > corrections are applied is different in half of them, you will have > problems getting all the systems to converge together. Would this not be true already, because the convergence of Linux system suddenly became a lot slower in 2.6.19? Damned if we do, damned if we don't - except the new behaviour introduced by your patches is nicer. -- All rights reversed. -- 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/