Re: [Xen-devel] repeatable time jump

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> " The only way that I can see that xen's system time can be changed
> " is via the DOM0_SETTIME dom0 op.
> 
> Its the system time in domain 0 that is changing.   The time dom0 gets
> by reading hwclock is ok.  Would hwclock time be what DOM0_SETTIME sets?
> 

No -- SETTIME effectively sets the dom0 system time, that Xen
also exports to other domains.

> I can reproduce it on that host, but most hosts don't have the
> problem.

Are you sure its only shutting down the xenU domain that causes
problems, rather than arbitrary activity in either domain?
Are the domains on the same CPU?

None of this makes much sense. It's certainly worth instrumenting
SETTIME.

Ian



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