Lines Matching defs:variance
175 uint64_t sum, variance;
207 /* Then try to determine variance */
208 variance = 0;
213 variance += diff * diff;
217 variance >>= INTERVAL_SHIFT;
219 do_div(variance, divisor);
223 * small (stddev <= 20 us, variance <= 400 us^2) or standard
225 * 6*stddev, avg^2 > 36*variance). The average is smaller than
233 if (likely(variance <= U64_MAX/36)) {
234 if ((((u64)avg*avg > variance*36) && (divisor * 4 >= INTERVALS * 3))
235 || variance <= 400) {