[sllug-members]: SLES clock drift

[Marc Christensen]

Matthew Hatch wrote:
> I've run unto this problem using an Athlon X2, as well as my laptop
> (Pentium M).  I've found the cause on these two machines to be the CPU's
> PowerNOW or Speedstep stuff changing my CPU clock speed.  If you change
> your cpufreq scaling governor to performance ("echo performance >
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" or some such),
> the clock skew is less noticeable in my experience.
> 
> A Windows host would change the power settings to "Always on" to achieve
> the same results, but we don't care about that here.  :)

Yeah -  I think I noticed or read the same thing.  I have been able to 
still keep my power settings to something that scales the CPU frequency 
however, once I did the changes to the kernel command line.  So, you 
still may be able to get by with lower power usage and still get a good 
clock in VMWare. YMMV.

--
Marc Christensen
http://blog.mecworks.com


> Marc Christensen wrote:
> This is a known issue.  Try adding 'clock=pit' to the kernel command
> line (usually in grub's menu.lst or in lilo.conf).  That solved my clock
> drift problems.  Also, make sure you're running ntp client to make up
> any smaller differences that may still be there.