if (p <= TFRC_CALC_X_SPLIT) { /* 0.0000 < p <= 0.05 */
if (p < TFRC_SMALLEST_P) { /* 0.0000 < p < 0.0001 */
- /*
- * In the congestion-avoidance phase p decays towards 0
- * when there are no further losses, so this case is
- * natural. Truncating to p_min = 0.01% means that the
- * maximum achievable throughput is limited to about
- * X_calc_max = 122.4 * s/RTT (see RFC 3448, 3.1); e.g.
- * with s=1500 bytes, RTT=0.01 s: X_calc_max = 147 Mbps.
- */
- tfrc_pr_debug("Value of p (%d) below resolution. "
- "Substituting %d\n", p, TFRC_SMALLEST_P);
+ DCCP_WARN("Value of p (%d) below resolution. "
+ "Substituting %d\n", p, TFRC_SMALLEST_P);
index = 0;
} else /* 0.0001 <= p <= 0.05 */
index = p/TFRC_SMALLEST_P - 1;
result = scaled_div(s, R);
return scaled_div32(result, f);
}
+
EXPORT_SYMBOL_GPL(tfrc_calc_x);
/**
index = tfrc_binsearch(fvalue, 0);
return (index + 1) * 1000000 / TFRC_CALC_X_ARRSIZE;
}
-EXPORT_SYMBOL_GPL(tfrc_calc_x_reverse_lookup);
-/**
- * tfrc_invert_loss_event_rate - Compute p so that 10^6 corresponds to 100%
- * When @loss_event_rate is large, there is a chance that p is truncated to 0.
- * To avoid re-entering slow-start in that case, we set p = TFRC_SMALLEST_P > 0.
- */
-u32 tfrc_invert_loss_event_rate(u32 loss_event_rate)
-{
- if (loss_event_rate == UINT_MAX) /* see RFC 4342, 8.5 */
- return 0;
- if (unlikely(loss_event_rate == 0)) /* map 1/0 into 100% */
- return 1000000;
- return max_t(u32, scaled_div(1, loss_event_rate), TFRC_SMALLEST_P);
-}
-EXPORT_SYMBOL_GPL(tfrc_invert_loss_event_rate);
+EXPORT_SYMBOL_GPL(tfrc_calc_x_reverse_lookup);