From owner-freebsd-questions@FreeBSD.ORG Fri Apr 4 12:42:57 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id A895A6BA for ; Fri, 4 Apr 2014 12:42:57 +0000 (UTC) Received: from mx1.rsle.net (mx1.rsle.net [IPv6:2607:ff40:b0b::4]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5DB609C3 for ; Fri, 4 Apr 2014 12:42:57 +0000 (UTC) Received: from prometheus.rsle.net (UNKNOWN [206.162.203.14] (may be forged)) (authenticated bits=0) by mx1.rsle.net (8.14.7/8.14.7) with ESMTP id s34CgfeF076977 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Fri, 4 Apr 2014 08:42:42 -0400 (EDT) (envelope-from nanog@rsle.net) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.98.1 at antivirus.rsle.net Message-ID: <533EA8BC.40202@rsle.net> Date: Fri, 04 Apr 2014 08:42:36 -0400 From: "R. Scott Evans" User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Maurizio Vairani , krad Subject: Re: Freebsd as a virtualbox HOST References: <533D22B6.6050107@cloverinformatica.it> In-Reply-To: <533D22B6.6050107@cloverinformatica.it> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.4.3 (mx1.rsle.net [206.162.201.2]); Fri, 04 Apr 2014 08:42:42 -0400 (EDT) Cc: freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Apr 2014 12:42:57 -0000 On 04/03/14 04:58, Maurizio Vairani wrote: > I am running FreeBSD 9.2-STABLE as a VirtualBox host with three Windows > 7 VM from February 2013. > The FreeBSD server has an Intel i7 with 64 GB RAM. The server and the > VMs are very, very stable. > I am writing this mail in a Windows 7 VM via Mac OS X Remote Desktop and > seems to work on real PC. > The only real, unique issue is the VM clock drift: it is slow, very > slow and I need to synchronize it every 5 minutes. > In the log I can read from +105ms to +50,43s as adjustment. > > Regards > Maurizio I had the exact same problem with clock drift pop up on one of my previously non-problematic FreeBSD VM's running on a FreeBSD host about a month or two ago when all the NTP attacks started. I locked down NTP at that time on the guest and host systems but also made a bunch of other changes trying to fix it so I'm not sure which was the final solution but if it wasn't the NTP issue my next guess was that it might have been a case of me updating the VirtualBox port (and others) on the host and then not reloading the virtualbox kernel module or rebooting the host after the port update. Regardless, it's not an issue for me any longer (ie, any drift I am seeing is minimal and ntpd is able to keep up on it's own). -scott