Vmware Server Clock Synchronisation (ubuntu host & guest)

[feeling367]

Hello, i've installed VmwareServer under a ubuntu host :

C2D E4200 + 1Gig memory

then I've installed ubuntu server 7.04 as guest.

I've a big clock drift ( about 10 minutes per hour faster than the host clock ).

I've set tools.syncTime = "TRUE" in the vmx file,
I've installed vmware tools in the guest and it's running !

root 3770 0.1 0.2 2040 656 ? Ss 10:20 0:02 /usr/sbin/vmware-guestd --background /var/run/vmware-guestd.pid


$ sudo ntpdate ntp.ubuntu.com
2 Aug 10:35:09 ntpdate[3960]: step time server 82.211.81.145 offset -673.188035 sec


and 1 minute later :

$ sudo ntpdate ntp.ubuntu.com
2 Aug 10:35:34 ntpdate[3961]: step time server 82.211.81.145 offset -8.511885 sec


... ok i've added the following lines to grub :
append="clock=pit nosmp noapic nolapic"

and the clock always drift :-(

somebody have an idea ?

[scxtt]

so you have a dual core HOST, are your VMs set up as single core or using both? ... i have a similar issue myself and even tho it's kinda working itself out (the longer the host is up, then i reboot the VMs - the better the time is) i used to have a cron job that would set the system time based off the hwclock (which was generally correct) ...

and my VMs were essentially ignoring the "syncTime" setting ...

i have a dual core AMD as the HOST and single core VMs ... if i use both CPUs for the VMs, networking doesn't work - odd!

[midspot]

would you mind sharing the cron script you used to sync the system time to the hwclock?

thanks

[dcstar]

Hello, i've installed VmwareServer under a ubuntu host :

C2D E4200 + 1Gig memory

then I've installed ubuntu server 7.04 as guest.

I've a big clock drift ( about 10 minutes per hour faster than the host clock ).
........
somebody have an idea ?

Is this any help (it seems to work for me)?:

http://blog.autoedification.com/2006/11/vmware-guest-clock-runs-fast.html

[scxtt]

would you mind sharing the cron script you used to sync the system time to the hwclock?

thanksfor me, the clock drift ended up being the result of AMD's CnQ / frequency scaling -- so i turned that off and my clocks have been fine ever since ...

[sufehmi]

for me, the clock drift ended up being the result of AMD's CnQ / frequency scaling -- so i turned that off and my clocks have been fine ever since ...

Nice hint, thanks.

A bit more info on this; to find out your CPU's current speed settings, type cpufreq-info

If it's not installed, type aptitude install cpufrequtils

You can set the CPU's speed setting as well. An example :

cpufreq-set -c 1 -g performance

This will set "max performance" for the second CPU core.

Hope it helps.