Performance Example
memory access time = 100 nanoseconds
swap fault overhead = 25 msec
EAT = (1-p) x 100 + p x (25 msec)
= (1-p) x 100 + p x 25,000,000
= 100 + 24,999,900 x p
= 100 + 24,999,900 x 1/1000 = 25 microseconds!
Want less than 10% degradation
110 > 100 + 24,999,900 x p
10 > 24,999,9000 x p
p < .0000004 or 1 fault in 2,500,000 accesses!