Re: [Xen-devel] #599161: Xen debug patch for the "clock shifts by 50 minutes" bug.

[Mauro <mrsanna1@xxxxxxxxx>]

On 9 November 2012 10:47, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 09.11.12 at 10:05, <Philippe.Simonet@xxxxxxxxxxxx> wrote:
>> oops, excuse me, here is a description : I have the problem on 4 systems,
>> all with same hardware.
>> the problem occured  on each system, 1 time each 2 month in average. since
>> January 2012, I decided to reboot them all monthly,
>> and the clock jump occurred only once in February ...
>>
>> SYSTEM :              HP ProLiant DL385 G7, with 2 * AMD Processor 6174 (12 
>> cores) = 24
>> cores, 16 GB MEMORY
>> XEN                            (XEN) Xen version 4.0.1 (Debian 4.0.1-5.4) 
>> (ultrotter@xxxxxxxxxx)
>> (gcc version 4.4.5 (Debian 4.4.5-8) ) Sat Sep  8 19:15:46 UTC 2012
>> DOM0                  Linux 2.6.32-5-xen-amd64 #1 SMP Sun Sep 23 13:49:30 
>> UTC 2012 x86_64
>> GNU/Linux
>> CPU
>> processor       : 0
>> vendor_id       : AuthenticAMD
>> cpu family      : 16
>> model           : 9
>> model name      : AMD Opteron(tm) Processor 6174
>
> Huh - so we have the problem on even different vendor CPUs (as
> Mauro's are Intel ones). But I take it that you haven't see an event
> yet with the debugging patch?
>
> Plus, what's puzzling me a little too - before the occurrence of the
> event on Mauro's system, I was under the impression that this
> requires quite a bit of uptime. Yet the event he observed occurred
> early on the second day after boot afaict.

Before the patch clock jumps on my systems occurred about once or twice at week.

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