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



On Tue, 10 Apr 2012, Chieu wrote:

thank you for help.

The special is when the time jumps forward, then the time won't change
and keep the time always。

for example, the time jumps to 4:00 from 3:30, then the time keeps 4:00。


Yes, I see exactly the same problem.  It has been there for years.

Steve Timm




2012/4/9 Steven Timm <timm@xxxxxxxx>:
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

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------------------------------------------------------------------
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.


------------------------------------------------------------------
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.
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users

 


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