linux-kernel - Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host time sample

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Message-ID: <CAL7Bo8FBBomXS13S6nmHcoGhmqYjbHGjTF=QxstuUSf+eYOhjw@mail.gmail.com>
Date:	Tue, 14 Oct 2014 17:46:24 +0100
From:	Mike Surcouf <mps.surcouf.lkml@...il.com>
To:	Thomas Shao <huishao@...rosoft.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>
Subject: Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host
 time sample

>The value for TICK_USEC is defined as ((1000000UL + USER_HZ/2) / USER_HZ).
> In my box, it's 10000.
OK got it thanks .  Checked the algorithm OK by me.
Of course you can only adjust clock by a tick (smallest resolution) so
you could be flapping between 2 values so as you say NTP is preferred.
However it may be good enough for some scenarios.
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