esm module and ntp problem

Ryan Go ryan at rentec.com
Wed Jan 15 17:27:00 CST 2003


Hello,

I don't know if this related but we are also having problems with
timekeeping on our machines. Kernel is vanilla 2.4.18 with rmap12h.

We are using xntpd 4.0.99f (I know this old, but I couldn't find any
relevant entry in the changelog)  and running SuSe 7.2 We are getting
approximately 5ms offset per minute (as seen from running ntpdate -q
every minute).

We are doing some testing now, I'll post my results to the list. If you
guys have any other ideas or other tests, please let me know.

Thanks,
	<< ryan

On Wed, 15 Jan 2003, Brian Smith wrote:

>
> Looking at my ntp logs in /var/log/messages, I see quite large jumps in
> time:
>
> Jan 15 04:54:12 test5 ntpd[716]: time reset 0.783464 s
> Jan 15 04:54:12 test5 ntpd[716]: synchronisation lost
> Jan 15 05:24:46 test5 ntpd[716]: time reset 0.492777 s
> Jan 15 05:24:46 test5 ntpd[716]: synchronisation lost
> Jan 15 06:15:19 test5 ntpd[716]: time reset 0.380051 s
> Jan 15 06:15:19 test5 ntpd[716]: synchronisation lost
> Jan 15 06:43:11 test5 ntpd[716]: time reset -0.609906 s
> Jan 15 06:43:11 test5 ntpd[716]: synchronisation lost
> Jan 15 07:14:33 test5 ntpd[716]: time reset 1.281493 s
> Jan 15 07:14:33 test5 ntpd[716]: synchronisation lost
> Jan 15 10:25:19 test5 ntpd[716]: time reset 3.868125 s
> Jan 15 10:25:19 test5 ntpd[716]: synchronisation lost
> Jan 15 11:57:38 test5 ntpd[716]: time reset 0.147323 s
> Jan 15 11:57:38 test5 ntpd[716]: synchronisation lost
>
>
> These logs are all after I have stopped all Dell OMSA software and unloaded
> the esm module on this (test5) system.  I stopped the software yesterday
> morning.  The system is quite idle and not performing any tasks at all.  A
> jump of 3.86 seconds in 3+ hours is really poor.  Test5 is a Dell PE2600.
> Kernel is 2.4.9-13 (no comments, please.  It is a requirement, not a
> choice).
>
> Perhaps my time problems are not related to the Dell OMSA software, but to
> the hardware or kernel.  I'll have to check other systems to see what their
> timekeeping history is like.
>
> I am used to seeing timeshifts of +/- 0.20000 s or less on non-Dell
> hardware, however these jumps are much larger.
>
>
>
>
>
>                     JP Vossen
>                     <vossenjp at netaxs.com        To:     Bryan Boatright <boatright at ieee.org>
>                     >                           cc:     Linux-Poweredge at dell.com
>                     Sent by:                    Subject:     Re: esm module and ntp problem
>                     linux-poweredge-admi
>                     n at dell.com
>
>
>                     01/15/03 11:33 AM
>
>
>
>
>
>
> On Wed, 15 Jan 2003, Bryan Boatright wrote:
>
> > I too am experiencing poor time keeping with my Dell PE600SC.  The
> machine
> > loses almost exactly 13 seconds daily.  I am not running ntp, but am
> > running ntpdate twice daily to keep the time drift under control.
>
> Ouch.  That is not the recommended way of doing things.  I hope you are not
> running any databases on that box.  Big "jumps" in time are generally BAD.
> Why can't you run ntpd?  Worst case, you can train it to correct for the 13
> sec. a day by itself.  Best case, just let it keep everything in symc.
>
>
> > Also, I am not running OSMA at all.  I am running kernel 2.4.20.  Anyone
> > have any thoughts?
>
> I wanted to point that out again for myself after Matt's last message.  I
> am NOT running esm either.  In my case, it *seems* to be my backup job
> (afio
> to a local IDE device).  I did not notice any clock drift, but I installed
> ntpd as soon as I built the server, so...
>
> I guess the next thing to try is to move my backup job date/time and see
> what
> happens.  Sigh.
>
> Later,
> JP
> ------------------------------|:::======|--------------------------------
> JP Vossen, CISSP              |:::======|                jp at jpsdomain.org
> My Account, My Opinions       |=========|       http://www.jpsdomain.org/
> ------------------------------|=========|--------------------------------
> "The software said it requires Windows 98 or better, so I installed
> Linux..."
>
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