eeh@netbsd.org wrote:
> 
> |The clock on my SS5/110, running 1.5S, drifts constantly, but only when the
> |machine is busy (that is, only when I'm at work using it). I've included
> |several days worth of NTP logs below, showing drifts of several seconds an
> |hour, but not at night and not over the weekend. Is this normal? Does my clock
> |just suck? Is it a Sun hardware thing?
> 
> That seems to be a common problem with recent kernels.  They appear to
> lose clock interrupts.  Maybe other interrupts as well.

I believe I've been seeing this for a while on other architectures too.
My recollection is that I judged this to be a CPU horse-power thing.
That is, the fewer MIPS your box has, the more the clock lossage occurs.
I noticed this on both PMAX and VAXen.