They are very similar it appears. One is "lock cmpxchg8" which causes a double
lock cycle on the bus (I believe its to the bus), the other is a dual issue
of an implicitly locked operation (again dual lock).
The other cyrix bug some folks see (divide by zero) does appear to be a
kernel bug. It appears the 6x86 can dual issue RDTSC and give the same clock
cycle back for both calls. Valid but Linux kind of assumes it isnt....
Alan