[Xen-devel] Re: time drift on dom0

[Andi Kleen <ak@xxxxxx>]

Anthony Liguori <anthony@xxxxxxxxxxxxx> writes:

> Adam Heath wrote:
>
>>I have just noticed a 9s drift in 12 hours in dom0(not running ntp, hadn't yet
>>been installed).
>>
>>
> I've been using Xen exclusively on one of my machines for the past
> couple of weeks and I've also noticed a time drift.  I've noticed it
> more as minutes over the course of a week.  I thought it was just my
> hardware dying...
>
> I've seen this on 2.0.2 with 2.6.9 and 2.0.3 with 2.6.10.

It's probably losing some timer interrupts. The lost tick handling
in Linux is not very clever and results in drifting time.

-Andi


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