I get that NTP can be installed locally. This is how I regulate time
on my guests. I agree the admin argument probably doesn't stand up.
The problem is hyperv_clocksource (pluggable time source used by
hyperv guests) is systematically fast in my environment. by around
-250 PPM.
I get away with
On Wed, 22 Oct 2014, Mike Surcouf wrote:
I get that NTP can be installed locally. This is how I regulate time
on my guests. I agree the admin argument probably doesn't stand up.
The problem is hyperv_clocksource (pluggable time source used by
hyperv guests) is systematically fast in my
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
On Tue, Oct 21, 2014 at 03:18:58AM +, Thomas Shao wrote:
In some situation, the user is not able to enable guest VM to sync with
external
time source, like NTP. But the host is still synced with a trusted time
source.
But the guest *is* networked, right?
(Otherwise syncing the
On Tue, 21 Oct 2014, Thomas Shao wrote:
I still do not have a consistent argument from you WHY you need to abuse
do_adjtimex() to do that host - guest synchronization in the first place.
I need a function to gradually slew guest time. do_adjtimex() provides all
the
functionality.
On Mon, Oct 20, 2014 at 11:02:13PM -0500, Jeff Epler wrote:
It's interesting to imagine that a virtualization host could present a
time service to the guest *userspace*, even when the guest is not
otherwise exposed to the internet at large. This could take the form of
an NTP server on a
On Tue, 21 Oct 2014, Thomas Shao wrote:
I didn't find a way to detect whether NTPd is running in the hyper-v module.
And you better do not try at all.
In http://doc.ntp.org/4.1.0/ntpd.htm, it mentioned: Normally, the
time is slewed if the offset is less than the step threshold, which
is
On Tue, 21 Oct 2014, Thomas Shao wrote:
I'm also thinking if NTPd could expose some interface to allow other
application to directly provide time source for it to consume. In my
opinion, emulating the ntp source should be very hard and error
prone.
Well, if done right it would be pretty
; a...@canonical.com; jasow...@redhat.com; KY Srinivasan;
John Stultz; Richard Cochran
Subject: RE: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Tue, 21 Oct 2014, Thomas Shao wrote:
I still do not have a consistent argument from you WHY you need to
abuse
do_adjtimex
Srinivasan; John Stultz; Richard Cochran
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Tue, Oct 21, 2014 at 03:18:58AM +, Thomas Shao wrote:
In some situation, the user is not able to enable guest VM to sync
with external time source, like NTP
...@linuxdriverproject.org; o...@aepfle.de; a...@canonical.com;
jasow...@redhat.com; KY Srinivasan; John Stultz; Richard Cochran
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Mon, Oct 20, 2014 at 11:02:13PM -0500, Jeff Epler wrote:
It's interesting to imagine
On Wed, 15 Oct 2014, Thomas Shao wrote:
And again you forgot to cc John Stultz on this
Export do_adjtimex function for hyper-v Time Synchronization component
Signed-off-by: Thomas Shao huis...@microsoft.com
---
kernel/time/timekeeping.c |1 +
1 files changed, 1 insertions(+), 0
On Mon, 20 Oct 2014, Thomas Gleixner wrote:
On Wed, 15 Oct 2014, Thomas Shao wrote:
And again you forgot to cc John Stultz on this
Export do_adjtimex function for hyper-v Time Synchronization component
Aside of that, we really want to see the use case for this and how you
addressed
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Wed, 15 Oct 2014, Thomas Shao wrote:
And again you forgot to cc John Stultz on this
I'll cc John Stultz in the future. Sorry for that.
Export do_adjtimex function for hyper-v Time Synchronization
; a...@canonical.com; jasow...@redhat.com; KY Srinivasan;
John Stultz; Richard Cochran
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Mon, 20 Oct 2014, Thomas Gleixner wrote:
On Wed, 15 Oct 2014, Thomas Shao wrote:
And again you forgot to cc John Stultz
...@linuxfoundation.org; LKML; de...@linuxdriverproject.org;
o...@aepfle.de; a...@canonical.com; jasow...@redhat.com; KY Srinivasan;
John Stultz; Richard Cochran
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Mon, 20 Oct 2014, Thomas Gleixner wrote:
On Wed, 15 Oct
; Richard Cochran
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Mon, Oct 20, 2014 at 8:18 PM, Thomas Shao huis...@microsoft.com
wrote:
-Original Message-
From: linux-kernel-ow...@vger.kernel.org [mailto:linux-kernel-
ow...@vger.kernel.org
On Tue, Oct 21, 2014 at 03:18:58AM +, Thomas Shao wrote:
In some situation, the user is not able to enable guest VM to sync with
external
time source, like NTP. But the host is still synced with a trusted time
source.
In this case, host-guest time synchronization is useful.
It's
; John Stultz; Richard Cochran
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
do_adjtimex()
On Tue, Oct 21, 2014 at 03:18:58AM +, Thomas Shao wrote:
In some situation, the user is not able to enable guest VM to sync
with external time source, like NTP. But the host
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