Jan Beulich wrote:
On 24.11.16 at 13:51, <per@opensuse.org> wrote: Jan Beulich wrote:
On 22.11.16 at 07:50, <Norman.Riess@dwd.de> wrote: i just installed our first Leap 42.2 DomU and as i wanted to adapt our usual scriptset i noticed, that the settings for independent wallclock seem to be missing. While the doc is stating that independent wallclock settings should apply for Leap 42.2, /proc/sys/xen is not showing the appropriate file.
/proc/sys/xen # ls balloon
Has something gone wrong during installation, or is the documentation faulty?
I don't think the pv-ops kernel has ever supported the concept of independent wallclock as configurable behavior. If you observe any misbehavior without it, please open a bug.
We started switching to independent wallclock when systemd was introduced - systemd kept complaining about the clock being adjusted or something like that.
Over time we had kernel problems in that area, so much would depend on when exactly you found it necessary to switch.
Judging by my mailing list postings, I think we started in March 2015. https://lists.opensuse.org/opensuse-virtual/2015-03/msg00020.html
Also I don't think your reply really demonstrates any observed misbehavior with the pv-ops kernel, yet that's the only criteria based upon which fixing that kernel or considering to re-introduce that control would become possible routes forward.
We observed ntp-related poor behaviour by systemd, that's all. Hundreds of message being written about "Time has been changed". Switching to local ntp and independent wallclock solved the issue.
After a lot of research, we switched to using independent_wallclock for all guests. Afair, this was/is also the SUSE/Novell recommendation.
Not as far as I know. As long as there are no bugs, running e.g. NTP once in Dom0 would seem the more efficient model compared to running it in every DomU. But of course I don't know who gave this recommendation, and in which context that was.
http://www.novell.com/documentation/vmserver/config_options/data/b9qzhq5.htm... https://doc.opensuse.org/documentation/leap/virtualization/html/book.virt/se... "To effectively use an external time source, such as NTP, for time synchronization on a virtual machine, the virtual machine's independent wallclock setting must be enabled (set to 1)." Perhaps not a recommendation, but given that systemd didn't like the domU just relying on the Dom0 clock, using running ntp in the DomU and enabling independent wallclock was a solution. https://wiki.debian.org/Xen/Clocksource https://lists.opensuse.org/opensuse-virtual/2015-03/msg00022.html I remember finding it very difficult to get any solid information on this topic. -- Per Jessen, Zürich (9.9°C) -- To unsubscribe, e-mail: opensuse-virtual+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-virtual+owner@opensuse.org