TSC cannot be used as a time source?

[Linn Kubler]

Hi,

Frist time posting here, if this is the wrong list for this type of
question please forgive me.

When I boot my server I get this message after logging in:
TSC cannot be used as a timesource.
Possible reasons for this are:
  You're running Speedstep,
  You don't have DMA enabled for you're hard disk (see hdparm),
  Incorrect TSC synchronization on an SMP system (see dmesg).
Falling back to a sane timesource now.

Can someone explain what's happening here and how to correct it?  When
I installed the server I used the same timesource I use on other
non-Linux systems.

BTW, this is an installation on VPC.

Thanks in advance,
Linn