Re: [Xen-devel] Xen 4.0.x 3,000 second time skew problem

[<Philippe.Simonet@xxxxxxxxxxxx>]

Hallo

i had the same  problem ** a lot of time **, on 4 different system, but not 
anymore since I reboot my machines at regular interval (each month ....)
what says your xm dmesg after the problem? what was your system uptime ? 

by me it occurs on 4 different  HP DL 385 with  AMD Opteron(tm) Processor 6174
but never on same machines but with Quad-Core AMD Opteron(tm) Processor 2384.

Regards

Philippe


> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxx] On Behalf Of Andy Smith
> Sent: Friday, June 08, 2012 4:19 PM
> To: xen-devel@xxxxxxxxxxxxx
> Cc: olivier.hanesse
> Subject: [Xen-devel] Xen 4.0.x 3,000 second time skew problem
> 
> Hi,
> 
> I have two installs of Xen 4.0.1 on Debian squeeze dom0s that occasionally
> skew the time by 3000 seconds. It is always 3000 seconds and it always
> affects all guests.
> 
> Depending on the kernels in the guests they will say:
> 
>     tp0 kernel: [9339489.266542] Clocksource tsc unstable (delta = -
> 2999660317697 ns)
> 
> or perhaps the kernel doesn't notice but ntpd does:
> 
>     ls0 ntpd[15009]: time reset -2999.683517 s
> 
> the point is it does affect all guests.
> 
> Back in February 2011 there was a thread started by Olivier Hanesse which
> appears to be exactly the same issue:
> 
>     http://old-list-archives.xen.org/archives/html/xen-users/2011-
> 02/msg00609.html
> 
> Like Olivier, one of my hosts used to run Xen 3.x and did not experience this
> issue until after it was upgraded to Xen 4. The other has only ever run 4.0.x
> so I don't know.
> 
> The above thread ends with Olivier using clocksource=pit on his Xen
> command line and waiting to see if it fixed things. If you are reading,
> Olivier, did it fix things for you?
> 
> These are Debian squeeze installs so using packaged versions of xen and
> kernel:
> 
> ii  linux-image-2.6.32-5-xen-amd64 2.6.32-45 Linux 2.6.32 for 64-bit PCs, Xen
> dom0 support
> ii  xen-hypervisor-4.0-amd64       4.0.1-4   The Xen Hypervisor on AMD64
> 
> One of the hosts affected is:
> 
> CPU: Xeon 5410
> Motherboard: Supermicro X7DCL-i
> 
> The other is:
> 
> CPU: Xeon E5606
> Motherboard: SUpermicro X8DTN+
> 
> but I do have other servers with same hardware as both of these that aren't
> affected.
> 
> Cheers,
> Andy
> 
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