From owner-freebsd-hackers@freebsd.org Wed Sep 23 19:53:27 2015 Return-Path: Delivered-To: freebsd-hackers@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 19C9AA08A6A for ; Wed, 23 Sep 2015 19:53:27 +0000 (UTC) (envelope-from reichert@numachi.com) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 0469B1DDF for ; Wed, 23 Sep 2015 19:53:27 +0000 (UTC) (envelope-from reichert@numachi.com) Received: by mailman.ysv.freebsd.org (Postfix) id 02BA2A08A69; Wed, 23 Sep 2015 19:53:27 +0000 (UTC) Delivered-To: hackers@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 02587A08A68 for ; Wed, 23 Sep 2015 19:53:27 +0000 (UTC) (envelope-from reichert@numachi.com) Received: from away.numachi.com (away.numachi.com [66.228.38.138]) by mx1.freebsd.org (Postfix) with SMTP id B0CEB1DDE for ; Wed, 23 Sep 2015 19:53:26 +0000 (UTC) (envelope-from reichert@numachi.com) Received: (qmail 1978 invoked from network); 23 Sep 2015 19:46:44 -0000 Received: from unknown (HELO meisai.numachi.com) (71.181.44.212) by away.numachi.com with SMTP; 23 Sep 2015 19:46:44 -0000 Received: (qmail 24291 invoked by uid 1001); 23 Sep 2015 19:27:29 -0000 Date: Wed, 23 Sep 2015 15:27:29 -0400 From: Brian Reichert To: Brandon Vincent Cc: Tim Kientzle , hackers@freebsd.org, Poul-Henning Kamp Subject: Re: What IS the right NTP behaviour ? Message-ID: <20150923192729.GB78209@numachi.com> References: <39337.1442999127@critter.freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.9i X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Sep 2015 19:53:27 -0000 On Wed, Sep 23, 2015 at 11:04:43AM -0700, Brandon Vincent wrote: > On Wed, Sep 23, 2015 at 10:35 AM, Tim Kientzle wrote: > > One concern I keep running into: Using NTP in VMs that are frequently suspended/resumed. Though I suppose this may be covered by your 'workstation' scenario (just step it after VM resume when you see the large skew). > > I would assume your hypervisor would sync the clock upon VM events. Does it not? In my VMs that run an NTP client, I keep the hypervisor out of the loop, and let the guest's NTP client to it's work. E.g.: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427 NTP Recommendations VMware recommends using NTP instead of VMware Tools periodic time synchronization. NTP is an industry standard and ensures accurate timekeeping in your guest. It may be necessary to open the firewall (UDP 123) to allow NTP traffic. > > Brandon Vincent > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" -- Brian Reichert BSD admin/developer at large