Re: [Xen-users] guest os time drift wild

[Andrew Bobulsky <rulerof@xxxxxxxxx>]

Clock drift was a really big problem with VMware workstation/server
(at least on AMD platforms) until hardware-assisted virtualization
came around and seemingly fixed the problem.  Are you running PV
guests?  If so, you might try switching them to HVM (which could be a
non-trivial task!) to work around the issue.

Just a suggestion, though.  No clue if it'll work :P

On Mon, Apr 9, 2012 at 10:04 AM, Steven Timm <timm@xxxxxxxx> wrote:
> On Mon, 9 Apr 2012, Chieu wrote:
>
>> HI, guys
>>
>> Recently,I met a problem.
>> Xen's version: 3.4.3
>> guest os:redhat 4.8 32bit
>>
>> And xen.independent_wallclock = 1 has been set.
>>
>> The time of guest os change to be fast suddenly, about 2000 second.
>> because the change is too wild, ntp didn't sync to the ntp server's time.
>>
>> my application is dependent on the systme time. And this occurs a lot of
>> times.
>>
>> I don't know which situation will cause this problem.
>
>
> I have seen this with many different versions of Redhat 32-bit
> guests (4.x and 5.x) on Xen from 3.1 upwards.  Never found a fix besides
> migrating all my guests to 64-bit.  independent_wallclock is
> better than not, but I see exactly the same problem that the clock
> jumps forward by 20-40 minutes and then just holds there until
> real time catches up to it.
>
> Steve Timm
>
>
>
>>
>> Does anyone can help me ?
>>
>> thank you!
>>
>> sincerely
>>
>> chieu
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
>>
>
> ------------------------------------------------------------------
> Steven C. Timm, Ph.D  (630) 840-8525
> timm@xxxxxxxx  http://home.fnal.gov/~timm/
> Fermilab Computing Division, Scientific Computing Facilities,
> Grid Facilities Department, FermiGrid Services Group, Group Leader.
> Lead of FermiCloud project.
>
>
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