From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756721AbYDMITn (ORCPT ); Sun, 13 Apr 2008 04:19:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752771AbYDMIT2 (ORCPT ); Sun, 13 Apr 2008 04:19:28 -0400 Received: from fg-out-1718.google.com ([72.14.220.158]:11498 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751444AbYDMITY (ORCPT ); Sun, 13 Apr 2008 04:19:24 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=LWsCBxeDNDpJDgjlgLNevUfHe0cFBl9zWW6KCSZP91JPC7CPvdNtwqsQSicl1tn/aNSxuJOKzDs4iwC7XkTLy4oZZUzMoNs4KsnF3LZuoH+oUxOg97WIlM8u4znNSrYuSoZLyUfuFBtrhDm9fLcnMSFwiBSdp81reh1k2SGWR6k= Message-ID: Date: Sun, 13 Apr 2008 10:19:22 +0200 From: "Bart Van Assche" To: "Marc Perkel" Subject: Re: AMD Quad Core clock problem? Cc: "Chris Snook" , linux-kernel@vger.kernel.org In-Reply-To: <735874.9676.qm@web52502.mail.re2.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <47FFD3F3.50107@redhat.com> <735874.9676.qm@web52502.mail.re2.yahoo.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 12, 2008 at 12:09 AM, Marc Perkel wrote: > > Is it possible due to calibration that ntpd isn't able > to correct the problem? Is there a setting to make ntp > more agressive? Clock crystals typically have an error between 20 and 200 ppm. ntpd can correct clock crystal errors of maximum 500 ppm. If I remember correctly the kernel limits frequency adjustments to 512 ppm. It's not a good idea to try to change this limit -- large clock crystal errors slow down convergence of ntpd's algorithms significantly. Bart.