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patches on r10968: compare advertised capacity, not bandwidthrate;

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and make the sorting order deterministic to avoid flapping.

also note that we could take the "is_auth" checks out of the
sorting entirely.


svn:r10970
This commit is contained in:
Roger Dingledine 2007-07-29 05:56:30 +00:00
parent 9031bbd4d8
commit a68e6e23c9
1 changed files with 13 additions and 5 deletions
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18
src/or/dirserv.c
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@ -1728,6 +1728,7 @@ _compare_routerinfo_by_ip_and_bw(const void **a, const void **b)
{
routerinfo_t *first = *(routerinfo_t **)a, *second = *(routerinfo_t **)b;
int first_is_auth, second_is_auth;
uint32_t bw_first, bw_second;
/* we return -1 if first should appear before second... that is,
* if first is a better router. */
@ -1736,6 +1737,8 @@ _compare_routerinfo_by_ip_and_bw(const void **a, const void **b)
else if (first->addr > second->addr)
return 1;
/* XXX020 k n lg n memcmps could show up bigtime in profiling. If
* they do, I suggest we just give authorities a free pass. -RD */
first_is_auth =
router_digest_is_trusted_dir(first->cache_info.identity_digest);
second_is_auth =
@ -1751,12 +1754,17 @@ _compare_routerinfo_by_ip_and_bw(const void **a, const void **b)
else if (!first->is_running && second->is_running)
return 1;
else if (first->bandwidthrate > second->bandwidthrate)
return -1;
else if (first->bandwidthrate < second->bandwidthrate)
bw_first = router_get_advertised_bandwidth(first);
bw_second = router_get_advertised_bandwidth(second);
if (bw_first > bw_second)
return -1;
else if (bw_first < bw_second)
return 1;
else
return 0;
/* They're equal! Compare by identity digest, so there's a
* deterministic order and we avoid flapping. */
return _compare_routerinfo_by_id_digest(a, b);
}
/** DOCDOC takes list of routerinfo */