linux-kernel - Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do

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Message-ID: <CAL7Bo8GzE+qdz0Y2HkjpZwPSrGxs-KpzW6qaDoXkfntmSNuQ2g@mail.gmail.com>
Date:	Wed, 22 Oct 2014 15:20:25 +0100
From:	Mike Surcouf <mps.surcouf.lkml@...il.com>
To:	Thomas Shao <huishao@...rosoft.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Jeff Epler <jepler@...ythonic.net>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	LKML <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>,
	John Stultz <john.stultz@...aro.org>,
	Richard Cochran <rcochran@...utronix.de>
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex()

> Mike, can you share me your kernel version and which Linux distro do you use?

2.6.32-504.el6.x86_64 AKA RHEL 6.6
Happened on centos 7 and 6.5 too.
#cat /var/lib/ntp/drift
-248.869
About 20 secs a day (constant)

Its not a new problem I had this in other distros and other kernels.
I would say its environmental but not just my environment.

Confirmed with Olaf on SUSEvariants back in  2012 but never came to anything

see enc email

---------------------------------------------
> > KY, can your team have a look at this?
>
> Vijay, have we done time stability test in the recent past. We should
> look at replicating this issue on Distros of interest. Olaf, on sles11
> sp2, were you running NTP and how much was the drift.

sles11sp2: uptime 23:45 hours, its 38 seconds ahead

12.2: uptime 1 day, 5:17 hours, its 47 seconds ahead

ntpd is not running in both guests.

> Also, what was the host in this test.

The host is an uptodate w2k8 r2.

Olaf
-----------------------------------------------

Thanks

Mike
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