diff options
| -rw-r--r-- | tcp.c | 15 |
1 files changed, 14 insertions, 1 deletions
@@ -1211,8 +1211,21 @@ int tcp_update_seqack_wnd(const struct ctx *c, struct tcp_tap_conn *conn, * the MSS to zero, as we already have mechanisms in place to * force updates after the window becomes zero. This matches the * suggestion from RFC 813, Section 4. + * + * But don't do this if, either: + * + * - there's nothing in the outbound queue: the size of the + * sending buffer is limiting us, and it won't increase if we + * don't send data, so there's no point in waiting, or + * + * - we haven't sent data in a while (somewhat arbitrarily, ten + * times the RTT), as that might indicate that the receiver + * will only process data in batches that are large enough, + * but we won't send enough to fill one because we're stuck + * with pending data in the outbound queue */ - if (limit < MSS_GET(conn)) + if (limit < MSS_GET(conn) && sendq && + tinfo->tcpi_last_data_sent < tinfo->tcpi_rtt / 1000 * 10) limit = 0; new_wnd_to_tap = MIN((int)tinfo->tcpi_snd_wnd, limit); |