| 2017-03-27 21:31:53 |
Joshua R. Poulson |
bug |
|
|
added bug |
| 2017-03-27 21:32:12 |
Joshua R. Poulson |
linux (Ubuntu): status |
New |
Confirmed |
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| 2017-03-27 21:32:46 |
Joshua R. Poulson |
bug |
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added subscriber Alex Ng |
| 2017-03-27 21:54:01 |
Joshua R. Poulson |
description |
Please include the following upstream commit into lts-xenial, 16.04 HWE, Yakkity, and Zesty. This will improve the behavior of timesync on Hyper-V hosts while simultaneously using network time sync protocols like NTP.
commit 3716a49a81ba19dda7202633a68b28564ba95eb5
Author: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Sat Feb 4 09:57:14 2017 -0700
hv_utils: implement Hyper-V PTP source
With TimeSync version 4 protocol support we started updating system time
continuously through the whole lifetime of Hyper-V guests. Every 5 seconds
there is a time sample from the host which triggers do_settimeofday[64]().
While the time from the host is very accurate such adjustments may cause
issues:
- Time is jumping forward and backward, some applications may misbehave.
- In case an NTP server runs in parallel and uses something else for time
sync (network, PTP,...) system time will never converge.
- Systemd starts annoying you by printing "Time has been changed" every 5
seconds to the system log.
Instead of doing in-kernel time adjustments offload the work to an
NTP client by exposing TimeSync messages as a PTP device. Users may now
decide what they want to use as a source.
I tested the solution with chrony, the config was:
refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0
The result I'm seeing is accurate enough, the time delta between the guest
and the host is almost always within [-10us, +10us], the in-kernel solution
was giving us comparable results.
I also tried implementing PPS device instead of PTP by using not currently
used Hyper-V synthetic timers (we use only one of four for clockevent) but
with PPS source only chrony wasn't able to give me the required accuracy,
the delta often more that 100us.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
Please include the following upstream commit into lts-xenial, 16.04 HWE, Yakkity, and Zesty. This will improve the behavior of timesync on Hyper-V hosts while simultaneously using network time sync protocols like NTP.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/hv_util.c?id=3716a49a81ba19dda7202633a68b28564ba95eb5
commit 3716a49a81ba19dda7202633a68b28564ba95eb5
Author: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Sat Feb 4 09:57:14 2017 -0700
hv_utils: implement Hyper-V PTP source
With TimeSync version 4 protocol support we started updating system time
continuously through the whole lifetime of Hyper-V guests. Every 5 seconds
there is a time sample from the host which triggers do_settimeofday[64]().
While the time from the host is very accurate such adjustments may cause
issues:
- Time is jumping forward and backward, some applications may misbehave.
- In case an NTP server runs in parallel and uses something else for time
sync (network, PTP,...) system time will never converge.
- Systemd starts annoying you by printing "Time has been changed" every 5
seconds to the system log.
Instead of doing in-kernel time adjustments offload the work to an
NTP client by exposing TimeSync messages as a PTP device. Users may now
decide what they want to use as a source.
I tested the solution with chrony, the config was:
refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0
The result I'm seeing is accurate enough, the time delta between the guest
and the host is almost always within [-10us, +10us], the in-kernel solution
was giving us comparable results.
I also tried implementing PPS device instead of PTP by using not currently
used Hyper-V synthetic timers (we use only one of four for clockevent) but
with PPS source only chrony wasn't able to give me the required accuracy,
the delta often more that 100us.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
|
| 2017-03-27 22:00:48 |
Joseph Salisbury |
tags |
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kernel-da-key kernel-hyper-v xenial yakkety zesty |
|
| 2017-03-27 22:00:57 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Zesty |
|
| 2017-03-27 22:00:57 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Zesty) |
|
| 2017-03-27 22:00:57 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Yakkety |
|
| 2017-03-27 22:00:57 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Yakkety) |
|
| 2017-03-27 22:00:57 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Xenial |
|
| 2017-03-27 22:00:57 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Xenial) |
|
| 2017-03-27 22:01:04 |
Joseph Salisbury |
linux (Ubuntu Xenial): status |
New |
Triaged |
|
| 2017-03-27 22:01:06 |
Joseph Salisbury |
linux (Ubuntu Yakkety): status |
New |
Triaged |
|
| 2017-03-27 22:01:10 |
Joseph Salisbury |
linux (Ubuntu Zesty): status |
Confirmed |
Triaged |
|
| 2017-03-27 22:01:13 |
Joseph Salisbury |
linux (Ubuntu Xenial): importance |
Undecided |
Medium |
|
| 2017-03-27 22:01:15 |
Joseph Salisbury |
linux (Ubuntu Yakkety): importance |
Undecided |
Medium |
|
| 2017-03-27 22:01:18 |
Joseph Salisbury |
linux (Ubuntu Zesty): importance |
Undecided |
Medium |
|
| 2017-03-28 20:50:03 |
Tim Gardner |
linux (Ubuntu Zesty): status |
Triaged |
Fix Committed |
|
| 2017-03-28 21:33:54 |
Tim Gardner |
linux (Ubuntu Yakkety): status |
Triaged |
In Progress |
|
| 2017-03-28 21:33:54 |
Tim Gardner |
linux (Ubuntu Yakkety): assignee |
|
Tim Gardner (timg-tpi) |
|
| 2017-03-29 03:46:41 |
Doub |
bug |
|
|
added subscriber Doub |
| 2017-04-08 01:48:20 |
Launchpad Janitor |
linux (Ubuntu Zesty): status |
Fix Committed |
Fix Released |
|
| 2017-04-08 01:48:20 |
Launchpad Janitor |
cve linked |
|
2017-7308 |
|
| 2017-04-14 12:29:25 |
Tobias Wolf |
bug |
|
|
added subscriber Tobias Wolf |
| 2017-04-23 17:10:59 |
Daniel |
bug |
|
|
added subscriber Daniel |
| 2017-05-08 14:39:30 |
Thadeu Lima de Souza Cascardo |
linux (Ubuntu Yakkety): status |
In Progress |
Fix Committed |
|
| 2017-05-18 16:24:06 |
Brad Figg |
linux (Ubuntu Xenial): status |
Triaged |
Won't Fix |
|
| 2017-05-18 16:24:55 |
Brad Figg |
linux (Ubuntu Xenial): status |
Won't Fix |
Triaged |
|
| 2017-05-18 16:26:09 |
Joseph Salisbury |
linux (Ubuntu Xenial): status |
Triaged |
In Progress |
|
| 2017-05-18 16:26:14 |
Joseph Salisbury |
linux (Ubuntu Xenial): assignee |
|
Joseph Salisbury (jsalisbury) |
|
| 2017-05-29 10:12:23 |
Kleber Sacilotto de Souza |
tags |
kernel-da-key kernel-hyper-v xenial yakkety zesty |
kernel-da-key kernel-hyper-v verification-needed-yakkety xenial yakkety zesty |
|
| 2017-06-02 21:15:51 |
Alberto Ornaghi |
bug |
|
|
added subscriber Alberto Ornaghi |
| 2017-06-04 21:37:33 |
Bryan Silverthorn |
bug |
|
|
added subscriber Bryan Silverthorn |
| 2017-06-06 13:18:45 |
Kleber Sacilotto de Souza |
tags |
kernel-da-key kernel-hyper-v verification-needed-yakkety xenial yakkety zesty |
kernel-da-key kernel-hyper-v verification-done-yakkety xenial yakkety zesty |
|
| 2017-06-06 14:47:18 |
Launchpad Janitor |
linux (Ubuntu Yakkety): status |
Fix Committed |
Fix Released |
|
| 2017-06-06 14:47:18 |
Launchpad Janitor |
cve linked |
|
2017-0605 |
|
| 2017-06-08 22:02:26 |
Paul Gear |
bug |
|
|
added subscriber The Canonical Sysadmins |
| 2017-06-10 15:17:17 |
Rakesh Ginjupalli |
bug |
|
|
added subscriber Rakesh |
| 2017-06-12 07:32:32 |
Junien F |
bug |
|
|
added subscriber Junien Fridrick |
| 2017-06-14 14:34:11 |
Corey Melanson |
bug |
|
|
added subscriber Corey Melanson |
| 2017-06-21 14:24:07 |
Joseph Salisbury |
linux (Ubuntu Xenial): importance |
Medium |
High |
|
| 2017-06-26 12:10:03 |
Marcelo Cerri |
linux (Ubuntu Yakkety): assignee |
Tim Gardner (timg-tpi) |
|
|
| 2017-07-03 16:31:49 |
Thadeu Lima de Souza Cascardo |
linux (Ubuntu Xenial): status |
In Progress |
Fix Committed |
|
| 2017-07-04 11:36:37 |
Marcelo Cerri |
linux (Ubuntu Xenial): assignee |
Joseph Salisbury (jsalisbury) |
Marcelo Cerri (mhcerri) |
|
| 2017-07-07 12:56:28 |
Brad Figg |
tags |
kernel-da-key kernel-hyper-v verification-done-yakkety xenial yakkety zesty |
kernel-da-key kernel-hyper-v verification-done-xenial verification-done-yakkety xenial yakkety zesty |
|
| 2017-07-24 07:59:49 |
Launchpad Janitor |
linux (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
| 2017-07-24 07:59:49 |
Launchpad Janitor |
cve linked |
|
2017-1000364 |
|
| 2018-06-25 20:48:19 |
Dexuan Cui |
bug |
|
|
added subscriber Dexuan Cui |
