Re: [Xen-devel] Xen 4 TSC problems

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Sep 13, 2011 at 09:16:27AM +0200, Philippe Simonet wrote:
> Hi Xen developers

Lets try this again, this time Cc-ing Jeremy.
> 
> i just would like to inform you that I have exactly the same problem
> with Debian squeeze and xen, with
> 50 seconds time jump on my dom0 and domu. NTP is running on all
> dom0/domuU, clocksource is 'xen'
> everywhere.
> 
> some messages :
> syslog :
> Sep 11 13:56:50 dnsit22 kernel: [571603.359863] Clocksource tsc
> unstable (delta = -2999662111513 ns)
> 
> xm dmesg :
> ...
> (XEN) Platform timer is 14.318MHz HPET
> ...
> (XEN) Platform timer appears to have unexpectedly wrapped 10 or more times.
> (XEN) TSC marked as reliable, warp = 0 (count=2)
> ...
> 
> I had some contact with Olivier Hanesse and it indicates that he
> doesn't have any solution for this problem,
> and all what was proposed in February didn't solved this problem.


Which was the max_cstate=0 ?
..
> config :
> --------------------------------------
> Linux dnsit22.swissptt.ch 2.6.32-5-xen-amd64 #1 SMP Tue Jun 14
> 12:46:30 UTC 2011 x86_64 GNU/Linux
> --------------------------------------
> HP DL385
> --------------------------------------
> vendor_id       : AuthenticAMD
> cpu family      : 16
> model           : 9
> model name      : AMD Opteron(tm) Processor 6174
> stepping        : 1
> cpu MHz         : 3058776.574

OK, that is really messed up. Your house must be on fire for the machine
to be running at 3058GHz!

Jeremy, this sounds familiar - did we have a patch for this in
your 2.6.32 tree?

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