Import a hackish tool I use to examine the skew of the TSC across
CPUs in a system.  The tool queries the kernel for its set of CPUs
and compares TSC values on each of the additional CPUs to the first
CPU in turn.  It then outputs a table of simple statistics.
Use sh -c '...' to launch the dtb build scripts with env stuff prepended,
otherwise it tries to treat the env var stuff as a script file name.