[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Time Change Issue Xen 4.1
>>> On 11.11.11 at 19:39, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote: > On Fri, Nov 11, 2011 at 05:25:52PM +0000, Niall Fleming wrote: >> Hi all, >> >> Already posted this over in xen-users and Konrad confirms it as a >> bug and suggested to repost >> it over here! > > Laszlo, Paolo, Jan, you guys haven't seen domething like this? It looks > like a hypervisor issue where the wallclock time is not really dispursed > in the shared_info. Hypervisor? Upstream up to and including 3.1 just doesn't issue the necessary hypercalls. This was fixed only recently through patches from Jeremy. We had a different issue in that respect in the forward ported Linux trees, but that got fixed a couple of months ago, too. This not working in Jeremy's 2.6.32 tree is odd though, but I'm not certain which branches the necessary code would on. >> >> Issue is that changing the time in dom0 doesn't take effect on the >> VMs until a reboot of dom0. >> The testing example below illustrates what I mean.... >> >> Synopsis of testing: >> >> Booted the physical machine, date tells me it's 17:15:45. Hwclock agrees. >> Booted a VM (using xl as xm seems to be labouring under the >> impression that blockdev is missing - it isn't) >> The login prompt displays the time as 17:17, which is the expected >> behaviour. >> Changed the time in dom0 - (date +%T -s 12:00:00), synced to hwclock. >> Check that date and hwclock match - they do. >> Destroy the VM and recreate. >> The login prompt displays the time as 17:22. Unexpected! >> >> >> Kernel: I git cloned tag v3.1 from the kernel.org linux.git, and >> applied xen-settime patches >> Also tested with jeremy-git-xen-next-2.6.32 (.41/.46) without patch, >> they wouldn't apply. >> Xen: 4.1.1/4.1.2 >> Distribution: Gentoo >> >> It still doesn't work. >> >> I've tested that the issue also exists in Debian Squeeze (with >> linux-image-3.0.0 from testing as 2.6.32-5 is broken >> on my hardware). >> -- >> >> *Niall Fleming BSc. (Hons)* >> Systems Administrator >> Webanywhere Limited >> >> Phone: 0800 862 0131 Ext: 203 >> Web: http://www.webanywhere.co.uk >> >> Aire Valley Business Centre, Lawkholme Lane, Keighley, BD21 3BB >> Registered in England with company number 4881346 > >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@xxxxxxxxxxxxxxxxxxx >> http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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