Accurate aux-clock

Hello,

I'm trying to create an accurate Qdisc that would be able to work in
high data rate.

For that cause I need to have a high rate auxiliary clock. I'm working
on an Intel Pentium platform.

I want to do all the work in kernel mode (for efficiency).

1. Which clock should I use?
2. How do I set such a clock?
3. In case of interrupt masking, do the clock interrupts pend, or are
they
lost?