[Dovecot] Fwd: Re: "Time just moved backwards" in Dovecot in a Xen DomU

[Patrick Domack]

Dunno, your email provider doesn't want to talk to me, heh, screw them :)
They claim i'm on an rbl, no rbl checks verify this. Even tried to  
submit a request using their website, but it's broken and doesn't work  
(http://postmaster.ausics.net/pmg.php)

----- Forwarded message from patrickdk at patrickdk.com -----
     Date: Tue, 06 Oct 2009 23:31:37 -0400
     From: Patrick Domack <patrickdk at patrickdk.com>
  Subject: Re: [Dovecot] "Time just moved backwards" in Dovecot in a Xen DomU
       To: Noel Butler <noel.butler at ausics.net>

yes, using a pool server for that isn't good. but atleast it will let  
us know if it's just an internet path, or ALL internet paths for him  
that is causing issues, as it should give a good random sampling.

I have a few servers in the pool set to gigabit speeds. If people  
configure their settings correctly, the dsl/cable ones shouldn't get  
selected very often.

And the pool servers aren't the cause of his issues, as he isn't using  
any pools servers.

I think he has a network issue personally.

Quoting Noel Butler <noel.butler at ausics.net>:

> On Tue, 2009-10-06 at 23:08 -0400, Patrick Domack wrote:
>
>
>>
>> Jitter stops ntp from doing it's job properly. I'm not sure what is
>> causing you jitter to be so bad, but it's caused by the delay amount
>> changing from packet to packet. The delay should stay consistant (like
>> a ping time). If it keeps bouncing all over the place, ntp can't
>> figure out what time it really is, cause it doesn't know how long that
>> packet was on the network. You can safely ignore offset, it is just
>> how much different your clock is from what the other computer is.
>>
>> Try adding some of the pool servers in there, like:
>> server 0.us.pool.ntp.org
>> server 1.us.pool.ntp.org
>> server 2.us.pool.ntp.org
>>
>
>
> this can also be the cause of it all, there is no QA on hosts in pools,
> I've seen DSL and cable connected hosts in pools causing all sorts of
> problems for some, I'm lucky enough to be in a position where we have
> access to atomic servers so I can avoid all that, but most people are
> not.
>
>
> --
> Kind Regards,
> Noel Butler
> L.C.P #251002 (http://counter.li.org)
>
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----- End forwarded message -----