c316aa2cec
This is a vast improvement over the i8254, since it is a simple memory load rather than a comples sequence of interrupt blocking, multiple input/output instructions, and wrap-around detection. I have not bothered to time the fundamental timecounter get routine, but gettimeofday(2) is 10% faster with the ELAN timecounte. The downside is that HZ=100 is not enough, 150 or more recommended, I use 250 myself.