From owner-freebsd-stable@freebsd.org Tue Jan 23 10:48:38 2018 Return-Path: Delivered-To: freebsd-stable@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 9FF7DECA856 for ; Tue, 23 Jan 2018 10:48:38 +0000 (UTC) (envelope-from michaelp@bsquare.com) Received: from NAM01-SN1-obe.outbound.protection.outlook.com (mail-sn1nam01on0130.outbound.protection.outlook.com [104.47.32.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "Microsoft IT TLS CA 4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 574AF745E7 for ; Tue, 23 Jan 2018 10:48:37 +0000 (UTC) (envelope-from michaelp@bsquare.com) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=BsquareO365.onmicrosoft.com; s=selector1-bsquare-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=s30Uvt54rksNRjgs14t4fTej8vM7z1QcOGt3aetzM3E=; b=UBBbgV7h+lFoVUGm7f4p05DB4Ajlr58ox26M2bruNI3i3Wr1SZhi5k8qJf3hBkeW7MDMblqjO/D2Xm3oyWrr1zl8W8gptf/CSaWncxxoi27QJyrGowQIURsPRX33hI1wNywsSKZYtEHrcMCTueIvVB59zfRrOFx868HYb6mmjiQ= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=michaelp@bsquare.com; Received: from [10.150.16.65] (82.33.218.74) by CY4PR1301MB2023.namprd13.prod.outlook.com (10.171.223.157) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.444.5; Tue, 23 Jan 2018 10:48:35 +0000 Subject: Re: Clock occasionally jumps backwards on 11.1-RELEASE To: freebsd-stable@freebsd.org References: From: Mike Pumford Message-ID: <0b170dae-b816-ea49-3516-40bfd1deaa2a@bsquare.com> Date: Tue, 23 Jan 2018 10:48:29 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Originating-IP: [82.33.218.74] X-ClientProxiedBy: DB6P193CA0017.EURP193.PROD.OUTLOOK.COM (10.175.237.27) To CY4PR1301MB2023.namprd13.prod.outlook.com (10.171.223.157) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1f73334a-c6ab-422b-9ac0-08d5624edade X-Microsoft-Antispam: UriScan:; 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Has anybody seen > something like this? > > Details > ===== > > * Happens about once a day on my jail server, and has happened at least > once on a separate bhyve server. > > * The jumps almost always happen between 1 and 3 AM, but I've also seen > them happen at 06:30 and 20:15. > That's the window when the period scripts are run which if you have a default configuration and a lot of jails will put the system under a lot of stress. > * I'm using the default ntp.conf file. > Are you running ntpd inside the jail or on the jail host? On my jail systems (which are 10.3 and 11.1) I run ntpd out the jail host (outside all jails) and not inside the jails and the jails then get the accurate time as the underlying host has accurate time. Mike -- Mike Pumford | Senior Software Engineer T: +44 (0) 1225 710635 BSQUARE - The business of IoT www.bsquare.com