[ut3] Negative Delta Time on Xen VPS

Alan Huseby lists at brainless.us
Mon Jan 21 11:19:27 EST 2008


I'm not running ntpd on my vps.  I do not know about the host though; if its time was updated would that effect all the vps's?

If Icculus will change the server's behavior, I'll just patiently wait for the next patch (unless he needs a beta tester :))

Thanks!
  ----- Original Message ----- 
  From: biz 
  To: ut3 at icculus.org 
  Sent: Monday, January 21, 2008 10:14 AM
  Subject: Re: [ut3] Negative Delta Time on Xen VPS


  On Sun, Jan 20, 2008 at 11:07:13PM -0500, Masher wrote:
  > Critical: Detected negative delta time - on AMD systems please install
  > http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,0
  > 0.html

  Are you running a ntp daemon? UT3 uses gettimeofday(), thus it will 
  crash if ntpd slows down the system clock while the server is running.

  Icculus wrote he'll change this:
  > The next patch will change Unreal's behaviour to just consider the 
  > current frame as zero milliseconds, add a line to the logfile, and 
  > continue on...so you might get a small time distortion of a few 
  > milliseconds if this is a one-time occurrence, but the server won't crash.

  If you don't depend on real sync with timeservers, just shut down
  services using gettimeofday(), use ntpdate to set the time
  and restart services and the UT3 server again.

  Note: ntpdate jumps once to sync time, ntpd tries to do this in forms
  of slowing down or speeding up the system clock so that running services
  don't crash. Just wait for the next patch if you _need_ ntpd.



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