diff options
| -rw-r--r-- | net/dccp/ccids/lib/tfrc_equation.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/dccp/ccids/lib/tfrc_equation.c b/net/dccp/ccids/lib/tfrc_equation.c index bc3dc2b2a84..38239c4d5e1 100644 --- a/net/dccp/ccids/lib/tfrc_equation.c +++ b/net/dccp/ccids/lib/tfrc_equation.c @@ -632,8 +632,16 @@ u32 tfrc_calc_x(u16 s, u32 R, u32 p) if (p <= TFRC_CALC_X_SPLIT) { /* 0.0000 < p <= 0.05 */ if (p < TFRC_SMALLEST_P) { /* 0.0000 < p < 0.0001 */ - DCCP_WARN("Value of p (%d) below resolution. " - "Substituting %d\n", p, TFRC_SMALLEST_P); + /* + * 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); index = 0; } else /* 0.0001 <= p <= 0.05 */ index = p/TFRC_SMALLEST_P - 1; |