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bgpd: Optimizing route-map's processing of dependencies.

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Say for eg., 256 prefix-list entries are pasted to VTYSH.
This results in BGP processing the events for several minutes.

BGPD starts a timer for 5 seconds when the first dependency configuraion
is received. On timer expiry, BGP process dependent route-maps.
After this processing, BGPD reads the configurations received in the
next 5 seconds and then re-processes the route-maps from the beginning.
This cyclic re-processing consumes time and CPU cycles.

Instead of starting a timer when the first configuration is received,
everytime a configuration is received, the existing timer is reset.
This would mean that all the configurations are read first before the timer
expires. This eliminates the cyclic re-processing.

Signed-off-by: NaveenThanikachalam nthanikachal@vmware.com
This commit is contained in:
Naveen Thanikachalam 2019-08-11 04:24:15 -07:00
parent ab0ef7a392
commit 47c8fa1f87
1 changed files with 24 additions and 21 deletions
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45
bgpd/bgp_routemap.c
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@ -3406,31 +3406,34 @@ int bgp_route_map_update_timer(struct thread *thread)
static void bgp_route_map_mark_update(const char *rmap_name)
{
if (bm->t_rmap_update == NULL) {
struct listnode *node, *nnode;
struct bgp *bgp;
struct listnode *node, *nnode;
struct bgp *bgp;
/* rmap_update_timer of 0 means don't do route updates */
if (bm->rmap_update_timer) {
bm->t_rmap_update = NULL;
thread_add_timer(bm->master, bgp_route_map_update_timer,
NULL, bm->rmap_update_timer,
&bm->t_rmap_update);
/* If new update is received before the current timer timed out,
* turn it off and start a new timer.
*/
if (bm->t_rmap_update != NULL)
THREAD_OFF(bm->t_rmap_update);
/* Signal the groups that a route-map update event has
* started */
for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp))
update_group_policy_update(bgp,
BGP_POLICY_ROUTE_MAP,
rmap_name, 1, 1);
} else {
for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp))
bgp_route_map_process_update(bgp, rmap_name, 0);
/* rmap_update_timer of 0 means don't do route updates */
if (bm->rmap_update_timer) {
thread_add_timer(bm->master, bgp_route_map_update_timer,
NULL, bm->rmap_update_timer,
&bm->t_rmap_update);
/* Signal the groups that a route-map update event has
* started */
for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp))
update_group_policy_update(bgp,
BGP_POLICY_ROUTE_MAP,
rmap_name, 1, 1);
} else {
for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp))
bgp_route_map_process_update(bgp, rmap_name, 0);
#if ENABLE_BGP_VNC
zlog_debug("%s: calling vnc_routemap_update", __func__);
vnc_routemap_update(bgp, __func__);
zlog_debug("%s: calling vnc_routemap_update", __func__);
vnc_routemap_update(bgp, __func__);
#endif
}
}
}