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-   -   Bug#674907: shifts the clock by 50 minutes unexplicably under a Xen dom0 (http://www.linux-archive.org/debian-kernel/708842-bug-674907-shifts-clock-50-minutes-unexplicably-under-xen-dom0.html)

Jonathan Nieder 10-01-2012 06:01 PM

Bug#674907: shifts the clock by 50 minutes unexplicably under a Xen dom0
 
Hi Antoine,

anarcat wrote:

> Why was this reassigned to the linux kernel?
>
> I explicitely stated (twice) that machines not running Xen are *not*
> affected, so this is specifically a Xen issue.

Xen in squeeze consists of both a hypervisor and tools and a kernel
patch, and potential changes to the kernel patch are tracked in the
BTS by assigning to the kernel package. I doubt Bastian meant to
imply that your problem affects non-Xen systems.

> I do not want to get into an edit war here, if there is proper
> justification I don't mind having it assigned to anything...

This particular bug is known to be a domU problem, so I suspect
Bastian made the right call. If he has overlooked something, we'd
welcome the missing information.

Hoping that clarifies,
Jonathan


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Mauro 10-01-2012 06:09 PM

Bug#674907: shifts the clock by 50 minutes unexplicably under a Xen dom0
 
On 1 October 2012 20:01, Jonathan Nieder <jrnieder@gmail.com> wrote:

> This particular bug is known to be a domU problem, so I suspect
> Bastian made the right call. If he has overlooked something, we'd
> welcome the missing information.

The problem happens also in dom0.


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Jonathan Nieder 10-01-2012 06:24 PM

Bug#674907: shifts the clock by 50 minutes unexplicably under a Xen dom0
 
Mauro wrote:

> The shift time happens also in dom0 not only in domUs.

Thanks.

Just gathering information: some references:

http://thread.gmane.org/gmane.comp.emulators.xen.user/75486
http://thread.gmane.org/gmane.comp.emulators.xen.user/65530

What's the newest kernel and hypervisor you've tried (since
this should make it easier to get help from upstream)?


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Antoine Beaupré 10-01-2012 07:17 PM

Bug#674907: shifts the clock by 50 minutes unexplicably under a Xen dom0
 
On 2012-10-01, Jonathan Nieder wrote:
> Mauro wrote:
>
>> The shift time happens also in dom0 not only in domUs.
>
> Thanks.
>
> Just gathering information: some references:
>
> http://thread.gmane.org/gmane.comp.emulators.xen.user/75486
> http://thread.gmane.org/gmane.comp.emulators.xen.user/65530

Really interesting discussions, here's what I can extract from it.

Other people have the same problem, and have applied various
workarounds:

* clocksource=jiffies - fails for us <http://news.gmane.org/find-root.php?message_id=%3c1346056240.25805.6.camel%40 wotan2%3e>
* clocksource=tsc <http://news.gmane.org/find-root.php?message_id=%3c1346148479.25805.47.camel%4 0wotan2%3e>
* clocksource=pit, cpuidle=0 <http://news.gmane.org/find-root.php?message_id=%3c503BB696.3030603%40pa.metro cast.net%3e>

We'll be trying those 2 last workarounds and report back here.

> What's the newest kernel and hypervisor you've tried (since
> this should make it easier to get help from upstream)?

We haven't tried upgrading to backports - we are running plain squeeze.

--
The world is a dangerous place, not because of those who do evil,
but because of those who look on and do nothing.
- Albert Einstein

Mauro 10-01-2012 09:18 PM

Bug#674907: shifts the clock by 50 minutes unexplicably under a Xen dom0
 
On 1 October 2012 20:24, Jonathan Nieder <jrnieder@gmail.com> wrote:
> Mauro wrote:
>
>> The shift time happens also in dom0 not only in domUs.
>
> Thanks.
>
> Just gathering information: some references:
>
> http://thread.gmane.org/gmane.comp.emulators.xen.user/75486
> http://thread.gmane.org/gmane.comp.emulators.xen.user/65530
>
> What's the newest kernel and hypervisor you've tried (since
> this should make it easier to get help from upstream)?

uname -a
Linux xen-p01 2.6.32-5-xen-amd64 #1 SMP Sun Sep 23 13:49:30 UTC 2012
x86_64 GNU/Linux

xm dmesg | grep version
(XEN) Xen version 4.0.1 (Debian 4.0.1-5.4) (ultrotter@debian.org) (gcc
version 4.4.5 (Debian 4.4.5-8) ) Sat Sep 8 19:15:46 UTC 2012


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