From owner-freebsd-questions@freebsd.org Wed Dec 28 14:26:52 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DB68DC9430D for ; Wed, 28 Dec 2016 14:26:52 +0000 (UTC) (envelope-from byrnejb@harte-lyne.ca) Received: from inet08.hamilton.harte-lyne.ca (inet08.hamilton.harte-lyne.ca [216.185.71.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "inet08.hamilton.harte-lyne.ca", Issuer "CA HLL ISSUER 01" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id AF65D1AD1 for ; Wed, 28 Dec 2016 14:26:51 +0000 (UTC) (envelope-from byrnejb@harte-lyne.ca) Received: from localhost (localhost [127.0.0.1]) by inet08.hamilton.harte-lyne.ca (Postfix) with ESMTP id 71AA4621F6 for ; Wed, 28 Dec 2016 09:26:45 -0500 (EST) X-Virus-Scanned: amavisd-new at harte-lyne.ca Received: from inet08.hamilton.harte-lyne.ca ([127.0.0.1]) by localhost (inet08.hamilton.harte-lyne.ca [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kYaqc09OGGT7 for ; Wed, 28 Dec 2016 09:26:43 -0500 (EST) Received: from webmail.harte-lyne.ca (inet04.hamilton.harte-lyne.ca [216.185.71.24]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by inet08.hamilton.harte-lyne.ca (Postfix) with ESMTPSA id 887AF621DE for ; Wed, 28 Dec 2016 09:26:43 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=harte-lyne.ca; s=dkim_hll; t=1482935203; bh=APl7vqiD2pKPgMkbLr5McncAqk7AYzOKLlIUxR4xmRo=; h=Date:Subject:From:To:Reply-To; b=fWAsYV3UndaErwD38NsKag0ArXzJ2EOS1JLVuZ/dYdiZjqxje+SAguH+zjnZ3PA47 XuavXA3Ch9e2fqfyoMifD9kP8oS0I7cqA3lpSyhAkEoxR4xXg8Rbwf2lJvPV1S/tEI JtjBALlRKFUkinGsT/8M7TL9vOPTIbAqmWxzJHQ3gVUMhGwtIAyxB7u99auyPmjJtb 1LCS0lZIi0grBbWfe3h4573WtelEcERFhjQoZWEChY+1RZRF1MVDwW+DmcGpU8VkNY 29dsZg/wqJVMUXtdkeJfwZTnAhUrPW/tVc5TZ6AdulBYrdzTFqXrfVYXZai/n2Xcke h5MVOih9We3Ww== Received: from 216.185.71.44 (SquirrelMail authenticated user byrnejb_hll) by webmail.harte-lyne.ca with HTTP; Wed, 28 Dec 2016 09:26:43 -0500 Message-ID: <3671ad3ac07b36b28e1583a2020a6108.squirrel@webmail.harte-lyne.ca> Date: Wed, 28 Dec 2016 09:26:43 -0500 Subject: FreeBSD-11.0 BHyve ntpd issues From: "James B. Byrne" To: freebsd-questions@freebsd.org Reply-To: byrnejb@harte-lyne.ca User-Agent: SquirrelMail/1.4.22-4.el6 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Dec 2016 14:26:53 -0000 I see this in /var/log/messages: > Dec 28 03:57:47 SAMBA-01 ntpd[560]: > frequency error -500 PPM exceeds tolerance 500 PPM > Dec 28 06:05:04 SAMBA-01 ntpd[560]: > frequency error -500 PPM exceeds tolerance 500 PPM Reading up on ntpd issues wrt vm's I ran these diagnostics on the vm: [root@SAMBA-01 ~]# dmesg | grep Timecounter Timecounter "i8254" frequency 1193182 Hz quality 0 Timecounter "HPET" frequency 10000000 Hz quality 950 Timecounter "ACPI-fast" frequency 3579545 Hz quality 900 Timecounters tick every 1.000 msec [root@SAMBA-01 ~]# sysctl kern.timecounter.hardware kern.timecounter.hardware: HPET I also found this thread, https://lists.freebsd.org/pipermail/freebsd-virtualization/2016-April/004382.html, on the FreeBSd list which suggested the following fix: > I found errors in /var/log/messages and fix adding: > > kern.timecounter.hardware=TSC-low > into /etc/sysctl.conf file I can add this as suggested but before I do can someone enlighten as to what is happening, why it happens, what the consequences are of not dealing with the problem, and what the recommended fix accomplishes. Should this suggestion be implemented or is there a better solution? The vm in question is, as its name suggests, a samba based AD-DC. Time synchronisation with the desktop units is critical for authentication. Thanks, -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3