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Only use the best rtt calculation once per ack

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This commit is contained in:
Jeremy Lakeman 2014-05-12 13:39:46 +09:30
parent 55db779f8c
commit 5b6ae35a73
1 changed files with 21 additions and 14 deletions
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35
overlay_queue.c
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@ -554,6 +554,8 @@ int overlay_queue_ack(struct subscriber *neighbour, struct network_destination *
{
int i, j;
time_ms_t now = gettime_ms();
int rtt=0;
for (i=0;i<OQ_MAX;i++){
struct overlay_frame *frame = overlay_tx[i].first;
@ -570,21 +572,12 @@ int overlay_queue_ack(struct subscriber *neighbour, struct network_destination *
char acked = (seq_delta==0 || (seq_delta <= 32 && ack_mask&(1<<(seq_delta-1))))?1:0;
if (acked){
int rtt = now - frame->destinations[j].transmit_time;
int this_rtt = now - frame->destinations[j].transmit_time;
// if we're on a fake network, the actual rtt can be unrealistic
if (rtt <5)
rtt=5;
if (!destination->min_rtt || rtt < destination->min_rtt){
destination->min_rtt = rtt;
int delay = rtt * 2 + 40;
if (delay < destination->resend_delay){
destination->resend_delay = delay;
if (config.debug.linkstate)
DEBUGF("Adjusting resend delay to %d", destination->resend_delay);
}
}
if (!destination->max_rtt || rtt > destination->max_rtt)
destination->max_rtt = rtt;
if (this_rtt < 10)
this_rtt = 10;
if (!rtt || this_rtt < rtt)
rtt = this_rtt;
if (config.debug.ack)
DEBUGF("DROPPED DUE TO ACK: Packet %p to %s sent by seq %d, acked with seq %d",
@ -610,5 +603,19 @@ int overlay_queue_ack(struct subscriber *neighbour, struct network_destination *
frame = frame->next;
}
}
if (rtt){
if (!destination->min_rtt || rtt < destination->min_rtt){
destination->min_rtt = rtt;
int delay = rtt * 2 + 40;
if (delay < destination->resend_delay){
destination->resend_delay = delay;
if (config.debug.linkstate)
DEBUGF("Adjusting resend delay to %d", destination->resend_delay);
}
}
if (!destination->max_rtt || rtt > destination->max_rtt)
destination->max_rtt = rtt;
}
return 0;
}