From owner-freebsd-virtualization@FreeBSD.ORG Sun May 31 13:59:10 2009 Return-Path: Delivered-To: freebsd-virtualization@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 141611065670 for ; Sun, 31 May 2009 13:59:10 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) by mx1.freebsd.org (Postfix) with ESMTP id C45B88FC13 for ; Sun, 31 May 2009 13:59:09 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from localhost (localhost.codelab.cz [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id 24D2619E044 for ; Sun, 31 May 2009 15:59:07 +0200 (CEST) Received: from [192.168.1.2] (r5bb235.net.upc.cz [86.49.61.235]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id D916E19E043 for ; Sun, 31 May 2009 15:59:04 +0200 (CEST) Message-ID: <4A228D29.30804@quip.cz> Date: Sun, 31 May 2009 15:59:05 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 X-Accept-Language: cz, cs, en, en-us MIME-Version: 1.0 To: freebsd-virtualization@freebsd.org References: <4A096517.7020104@quip.cz> In-Reply-To: <4A096517.7020104@quip.cz> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: problem with time and cronjobs in Qemu guest X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 31 May 2009 13:59:10 -0000 Miroslav Lachman wrote: > Hi, > > I have Qemu 0.10.1 installed on my old Windows 2000 PC and I am running > FreeBSD 7.2-RC1 i386 in it for some testing purposes. Today I realized > that some cron task was not run at specified time nor some commands in > endless loop. > > This is simple example of strange behavior (written in tcsh shell) > root@firstbsd ~/# while 1 > while?date > while?sleep 10 > while?end > Tue May 12 13:43:20 CEST 2009 > Tue May 12 13:43:58 CEST 2009 > Tue May 12 13:44:35 CEST 2009 > Tue May 12 13:45:12 CEST 2009 > Tue May 12 13:45:50 CEST 2009 > Tue May 12 13:46:27 CEST 2009 > Tue May 12 13:47:04 CEST 2009 > Tue May 12 13:47:42 CEST 2009 > Tue May 12 13:48:20 CEST 2009 > Tue May 12 13:48:57 CEST 2009 > Tue May 12 13:49:37 CEST 2009 > Tue May 12 13:50:19 CEST 2009 > Tue May 12 13:50:58 CEST 2009 > Tue May 12 13:51:37 CEST 2009 > > As you can see - the date command in not executed every 10 seconds. > > Are there some settings (in FreeBSD guest or in Qemu itself) to fix this? It is better after adding kern.hz="50" in to loader.conf, but still not perfect: root@firstbsd ~/# while 1 while?date while?sleep 10 while?end Sun May 31 15:55:13 CEST 2009 Sun May 31 15:55:23 CEST 2009 Sun May 31 15:55:34 CEST 2009 Sun May 31 15:55:46 CEST 2009 Sun May 31 15:56:06 CEST 2009 Sun May 31 15:56:17 CEST 2009 Sun May 31 15:56:28 CEST 2009 Sun May 31 15:56:39 CEST 2009 Sun May 31 15:56:49 CEST 2009 Sun May 31 15:57:00 CEST 2009 any other workaround? Miroslav Lachman