Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932445AbaJNOOb (ORCPT ); Tue, 14 Oct 2014 10:14:31 -0400 Received: from mail-ig0-f175.google.com ([209.85.213.175]:38735 "EHLO mail-ig0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932165AbaJNOOW (ORCPT ); Tue, 14 Oct 2014 10:14:22 -0400 MIME-Version: 1.0 In-Reply-To: <20141014132551.GB5994@localhost.localdomain> References: <1413285078-7027-1-git-send-email-huishao@microsoft.com> <20141014115412.GC4019@localhost.localdomain> <20141014132551.GB5994@localhost.localdomain> Date: Tue, 14 Oct 2014 15:14:21 +0100 Message-ID: Subject: Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host time sample From: Mike Surcouf To: Richard Cochran Cc: Thomas Shao , "tglx@linutronix.de" , "gregkh@linuxfoundation.org" , "linux-kernel@vger.kernel.org" , "devel@linuxdriverproject.org" , "olaf@aepfle.de" , "apw@canonical.com" , "jasowang@redhat.com" , KY Srinivasan Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Even with networking I think there are other senarios where this would be useful such as no access to an NTP server due to firewall rules or no internal NTP or simply an admin without much knowledge of NTP. HyperV host very likely has good time from AD and it would be good if the Linux VM just synced its time from the host after a vanilla install (just like windows VMs). That would require no configuration and probably save a ton of support traffic. However this patch requires a module parameter which really negates the zero configuration argument. Also please don't make this the default until the timesync component is more comprehensive and provides a stable time of similar quality to NTP. VMware has put a lot of effort into host -> guest timesync so I think there is a case for some form of host based time sync on HyperV. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/