From owner-freebsd-hackers@freebsd.org Thu Sep 24 09:13:41 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 CB5A5A075B6 for ; Thu, 24 Sep 2015 09:13:41 +0000 (UTC) (envelope-from erik+lists@cederstrand.dk) 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 AD8541C19 for ; Thu, 24 Sep 2015 09:13:41 +0000 (UTC) (envelope-from erik+lists@cederstrand.dk) Received: by mailman.ysv.freebsd.org (Postfix) id AB3E8A075B4; Thu, 24 Sep 2015 09:13:41 +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 AAD77A075B3 for ; Thu, 24 Sep 2015 09:13:41 +0000 (UTC) (envelope-from erik+lists@cederstrand.dk) Received: from mailrelay8.public.one.com (mailrelay8.public.one.com [91.198.169.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D1D711C18 for ; Thu, 24 Sep 2015 09:13:40 +0000 (UTC) (envelope-from erik+lists@cederstrand.dk) X-HalOne-Cookie: 84d5acdb8e57486aa7e01f59dee47e0b22d14416 X-HalOne-ID: 606e74b3-629c-11e5-9643-b82a72cffc46 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=cederstrand.dk; s=20140924; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=VrJP1OsTi5oOxEXq1g45p5rBi9pridzWiZJHwfUyVJ0=; b=XaOfJ2vxgEWgOoz1syYm/7cepXG6hd0AZ4h7AVsgvXvSKg7+bXdZnV5PX18ME5pJjJ7xLEwQbi9sX bsAJzMi8ZiL7quGlc2SXv9r12+ZAJt7R1E/PNYhQuqorxWqWnAQoBj1iZ7E9rl8NAbMgw2qOf8tJ7F 50NqjQCtxIoXqCTQ= Received: from [192.168.187.69] (unknown [87.54.33.251]) by smtpfilter4.public.one.com (Halon Mail Gateway) with ESMTPSA; Thu, 24 Sep 2015 09:12:27 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Subject: Re: What IS the right NTP behaviour ? From: Erik Cederstrand In-Reply-To: Date: Thu, 24 Sep 2015 11:12:29 +0200 Cc: FreeBSD Hackers Content-Transfer-Encoding: quoted-printable Message-Id: <0CAEE340-B9DF-4772-8600-8A0904636452@cederstrand.dk> References: <39337.1442999127@critter.freebsd.dk> <20150923192729.GB78209@numachi.com> To: dirkx@webweaving.org X-Mailer: Apple Mail (2.2104) 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: Thu, 24 Sep 2015 09:13:41 -0000 > Den 23/09/2015 kl. 22.33 skrev dirkx@webweaving.org: >=20 >=20 >> On 23 Sep 2015, at 21:27, Brian Reichert = wrote: >>=20 >> 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). >>>=20 >>> I would assume your hypervisor would sync the clock upon VM events. = Does it not? >>=20 >> 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. >=20 >> = ..http://kb.vmware.com/selfservice/microsites/search.do?language=3Den_US&c= md=3DdisplayKC&externalId=3D1006427 >=20 > Aye - but I=E2=80=99ve not found any clean way of doing that =E2=80=94 = now a small rc.d file does a stop of ntpd, an ntpdate (because the jumps = are bigger than what ntpd by default will accomodate) and a restart of = ntpd. Does "tinker panic 0" in /etc/ntp.conf not work for you? Erik