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ospfd: fix performance problem with redistribute delete

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Doing redistribute delete with full BGP table was taking
30 minutes, this drops it down to less than a second.

* ospf_lsa.c: (ospf_lsa_maxage) When flushing lots of entries the
  performance is terrible because it looks up each LSA entry through
  ospf_lsa_maxage_exist before deleting causing O(N^2) performance.  Use a
  new OSPF_LSA_MAXAGE flag instead of scan - and maintain it.
  (ospf_lsa_maxage_exist) removed
  (ospf_lsa_maxage_delete) maintain OSPF_LSA_MAXAGE flag
This commit is contained in:
Stephen Hemminger 2009-08-06 12:58:05 -07:00 committed by Paul Jakma
parent 5996e0df2e
commit 3106a03215
2 changed files with 4 additions and 14 deletions
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17
ospfd/ospf_lsa.c
View File

@ -2958,19 +2958,6 @@ ospf_maxage_lsa_remover (struct thread *thread)
return 0;
}
static int
ospf_lsa_maxage_exist (struct ospf *ospf, struct ospf_lsa *new)
{
struct listnode *node;
struct ospf_lsa *lsa;
for (ALL_LIST_ELEMENTS_RO (ospf->maxage_lsa, node, lsa))
if (lsa == new)
return 1;
return 0;
}
void
ospf_lsa_maxage_delete (struct ospf *ospf, struct ospf_lsa *lsa)
{
@ -2979,6 +2966,7 @@ ospf_lsa_maxage_delete (struct ospf *ospf, struct ospf_lsa *lsa)
if ((n = listnode_lookup (ospf->maxage_lsa, lsa)))
{
list_delete_node (ospf->maxage_lsa, n);
UNSET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE);
ospf_lsa_unlock (&lsa); /* maxage_lsa */
}
}
@ -2988,7 +2976,7 @@ ospf_lsa_maxage (struct ospf *ospf, struct ospf_lsa *lsa)
{
/* When we saw a MaxAge LSA flooded to us, we put it on the list
and schedule the MaxAge LSA remover. */
if (ospf_lsa_maxage_exist (ospf, lsa))
if (CHECK_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE))
{
if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
zlog_debug ("LSA[Type%d:%s]: %p already exists on MaxAge LSA list",
@ -2997,6 +2985,7 @@ ospf_lsa_maxage (struct ospf *ospf, struct ospf_lsa *lsa)
}
listnode_add (ospf->maxage_lsa, ospf_lsa_lock (lsa));
SET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE);
if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
zlog_debug ("LSA[%s]: MaxAge LSA remover scheduled.", dump_lsa_key (lsa));

1
ospfd/ospf_lsa.h
View File

@ -80,6 +80,7 @@ struct ospf_lsa
#define OSPF_LSA_DISCARD 0x10
#define OSPF_LSA_LOCAL_XLT 0x20
#define OSPF_LSA_PREMATURE_AGE 0x40
#define OSPF_LSA_IN_MAXAGE 0x80
/* LSA data. */
struct lsa_header *data;