Comments on: CentOS NTPd Problem (Mostly) Resolved

By: slowe

slowe — Sat, 30 Dec 2006 19:27:00 +0000

Chris,

I believe that I finally got it working reasonably well with “acpi=off nosmp clock=pit noapic” (or similar; I can’t remember the exact syntax right at this moment). In addition, I added “burst iburst” to the ntp.conf file where the server(s) were defined. After those changes, it seemed to work reasonably well (still the occasional synchronization message in the log files).

Thanks for the help.

Scott

By: Chris Van Den Abbeele

Chris Van Den Abbeele — Sat, 30 Dec 2006 16:07:32 +0000

just my 2 cents :
I guess the correct syntax is acpi=off iso acpi=no
VM clock drift depends on the cpu of the host, if it does speed stepping then you’ll need acpi=off (on the host and on the vm’s)
chris

By: slowe

slowe — Mon, 16 Oct 2006 13:15:38 +0000

Clucien–I appreciate the info.

Scott

By: Clucien

Clucien — Mon, 16 Oct 2006 11:20:00 +0000

This seemed to work for me on a windows vmware server.

Got the idea from http://forum.openvz.org/index.php?t=msg&goto=7153&

You are adding ‘clock=pmtmr’ and booting from the ‘EL’ kernel.

You then add the ‘burst iburst’ to your ntp.conf.

1) grub.conf

default=1
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS_ServerCD (2.6.9-34.ELsmp)
root (hd0,0)
kernel /vmlinuz-2.6.9-34.ELsmp ro

root=/dev/VolGroup00/LogVol00 clock=pmtmr
initrd /initrd-2.6.9-34.ELsmp.img
title CentOS_ServerCD-up (2.6.9-34.EL)
root (hd0,0)
kernel /vmlinuz-2.6.9-34.EL ro

root=/dev/VolGroup00/LogVol00 clock=pmtmr
initrd /initrd-2.6.9-34.EL.img

2) ntp.conf

server 3.us.pool.ntp.org burst iburst
server 2.us.pool.ntp.org burst iburst
server 1.us.pool.ntp.org burst iburst
———–

I hope this helps someone.