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Neighbor ETX should accumulate over retransmission timeouts;

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Best neighbor has minimum sum of routing metric and neighbor ETX. Previously best neighbor prioritizes routing metric before neighbor ETX, which often causes a poor neighbor with a good upstream path to be selected.
This commit is contained in:
zhitao 2008-11-12 10:47:17 +00:00
parent 62854151d7
commit 229d60d691
1 changed files with 8 additions and 28 deletions
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36
core/net/rime/neighbor.c
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@ -33,7 +33,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: neighbor.c,v 1.15 2008/02/24 22:05:27 adamdunkels Exp $
* $Id: neighbor.c,v 1.16 2008/11/12 10:47:17 zhitao Exp $
*/
/**
@ -145,7 +145,7 @@ void
neighbor_timedout_etx(struct neighbor *n, uint8_t etx)
{
if(n != NULL) {
n->etxs[n->etxptr] = etx;
n->etxs[n->etxptr] += etx;
n->etxptr = (n->etxptr + 1) % NEIGHBOR_NUM_ETXS;
}
}
@ -277,12 +277,11 @@ neighbor_best(void)
{
int found;
/* int lowest, best;*/
struct neighbor *n, *lowest, *best;
struct neighbor *n, *best;
uint8_t rtmetric;
uint8_t etx;
rtmetric = RTMETRIC_MAX;
lowest = best = NULL;
best = NULL;
found = 0;
/* PRINTF("%d: ", node_id);*/
@ -290,32 +289,13 @@ neighbor_best(void)
/* Find the lowest rtmetric. */
for(n = list_head(neighbors_list); n != NULL; n = n->next) {
if(!rimeaddr_cmp(&n->addr, &rimeaddr_null) &&
rtmetric > n->rtmetric) {
rtmetric = n->rtmetric;
lowest = n;
found = 1;
rtmetric > n->rtmetric + neighbor_etx(n)) {
rtmetric = n->rtmetric + neighbor_etx(n);
best = n;
}
}
/* PRINTF("\n");*/
/* Find the neighbor with lowest etx of the ones that
have the lowest rtmetric. */
if(found) {
etx = 0;
best = lowest;
for(n = list_head(neighbors_list); n != NULL; n = n->next) {
/* for(i = 0; i < MAX_NEIGHBORS; ++i) {*/
if(!rimeaddr_cmp(&n->addr, &rimeaddr_null) &&
rtmetric == n->rtmetric &&
neighbor_etx(n) < etx) {
etx = neighbor_etx(n);
best = n;
}
}
return best;
}
return NULL;
return best;
}
/*---------------------------------------------------------------------------*/
void