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List:       linux-smp
Subject:    Re: XNTPD problem with SMP ?
From:       "Detlef Scholz" <detlef_scholz () eagle1 ! turner ! com>
Date:       1997-10-30 17:17:38
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did you try to finetune your system with tickadjust
i expirienced this behavior on machines with verry "acurat" HW
clockchips, on the otherhand i am running a older version of xntp
customized for my dcf77 server.

A good value to start with is tickadj 9999. delete the drift file and
let it run for at least a day. than see if the variation is better or
worse. repeat step ....

you can calculate the value also, based on the value in the drift file.
this is mentioned somewhere in the ntp docs, but dont ask me where.

:-) Detlef

Adoram Rogel wrote:
> 
> Dave Andruczyk wrote:
> >
> > > I'm experiencing very big offsets on an SMP machine running
> > > xntpd 3-5.90
> > > It starts great when I remove its drift file, but then it starts
> > > to gain drift, and as the drift grown, its offset grows.
> > > It gets to about 65 seconds each 24 hours.
> > > All the rest of my machines use the same xntpd and are in
> > > constant sync.
> > > The only effected machine is a Micron, Dual Ppro 200, running
> > > 2.0.30 + deadlock patch 6.
> > >
> > > Could this be SMP-related ?
> > > Any clues, anyone ?
> >
> > did you compile RTC clock support in the kernel??  I have heard that it
> > makes a difference on SMP machines for clock syncronization.
> 
> Looking at /usr/src/linux/.config I see CONFIG_RTC =y
> 
> Should it be on or off ?
> 
> > As for xntpd,  I use a cron script that kills xntpd, runs ntpdate off of
> > an accurate server, and restarts xntpd, once a day, to make  sure that
> > xntpd doesn't die if the clock goes too far off.
> 
> Good idea, I'll do that tonight.
> 
> > Dave
> 
> Thanks, Adoram
> --
> |----------------------------------------------------|
> | Adoram Rogel            email: adoram@HyBridge.com |
> | OpenSource Inc.           Tel: (518) 374-5147      |
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