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Fixed the export settle timer to be actually a settle timer

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This commit is contained in:
Maria Matejka 2022-09-21 18:43:44 +02:00
parent f51837ace6
commit b1ade5efa1
3 changed files with 26 additions and 22 deletions
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7
doc/bird.sgml
View File

@ -699,6 +699,13 @@ to set options.
threshold, the more memory can get used. In most cases, the defaults
should work for you. Default: 128, 512.
<tag><label id="rtable-export-settle-time">export settle time <m/time/ <m/time/</tag>
Minimum and maximum settle times, respectively, for export announcements.
When multiple routes are changing, this mechanism waits for the changes
to settle before waking up sleeping export threads but if the changes are coming
steadily, BIRD isn't waiting forever; at most the maximum time.
Default values: <cf/1 ms 100 ms/. You have to always provide both values.
<tag><label id="rtable-debug">debug all|off|{ states|routes|events [, <m/.../] }</tag>
Set table debugging options. Each table can write some trace messages
into log with category <cf/trace/. You can request <cf/all/ trace messages

36
nest/rt-table.c
View File

@ -1423,9 +1423,9 @@ rt_send_export_event(struct rt_export_hook *hook)
}
static void
rt_announce_exports(timer *tm)
rt_announce_exports(struct settle *s)
{
RT_LOCKED((rtable *) tm->data, tab)
RT_LOCKED(RT_PUB(SKIP_BACK(struct rtable_private, export_settle, s)), tab)
if (!EMPTY_LIST(tab->exporter.pending))
{
struct rt_export_hook *c; node *n;
@ -1439,13 +1439,6 @@ rt_announce_exports(timer *tm)
}
}
static void
rt_kick_announce_exports(struct rtable_private *tab)
{
if (!tm_active(tab->export_timer))
tm_start_in(tab->export_timer, tab->config->export_settle_time, tab->loop);
}
static void
rt_import_announce_exports(void *_hook)
{
@ -2521,7 +2514,7 @@ rt_flag_handler(struct birdloop_flag_handler *fh, u32 flags)
rt_next_hop_update(tab);
if (flags & RTF_EXPORT)
rt_kick_announce_exports(tab);
settle_kick(&tab->export_settle, tab->loop);
if (flags & RTF_CLEANUP)
{
@ -2789,10 +2782,11 @@ rt_setup(pool *pp, struct rtable_config *cf)
t->fh = (struct birdloop_flag_handler) { .hook = rt_flag_handler, };
t->nhu_uncork_event = ev_new_init(p, rt_nhu_uncork, t);
t->export_timer = tm_new_init(p, rt_announce_exports, t, 0, 0);
t->prune_timer = tm_new_init(p, rt_prune_timer, t, 0, 0);
t->last_rt_change = t->gc_time = current_time();
t->export_settle = SETTLE_INIT(&cf->export_settle, rt_announce_exports, NULL);
t->exporter = (struct rt_table_exporter) {
.e = {
.class = &rt_table_exporter_class,
@ -2944,8 +2938,7 @@ again:
FIB_ITERATE_END;
rt_trace(tab, D_EVENTS, "Prune done, scheduling export timer");
if (!tm_active(tab->export_timer))
tm_start_in(tab->export_timer, tab->config->export_settle_time, tab->loop);
settle_kick(&tab->export_settle, tab->loop);
#ifdef DEBUGGING
fib_check(&tab->fib);
@ -3172,7 +3165,7 @@ done:;
birdloop_flag(tab->loop, RTF_CLEANUP);
if (EMPTY_LIST(tab->exporter.pending))
tm_stop(tab->export_timer);
settle_cancel(&tab->export_settle);
}
static void
@ -3806,9 +3799,8 @@ rt_next_hop_update(struct rtable_private *tab)
{
rt_trace(tab, D_STATES, "Next hop updater corked");
if ((tab->nhu_state & NHU_RUNNING)
&& !EMPTY_LIST(tab->exporter.pending)
&& !tm_active(tab->export_timer))
tm_start_in(tab->export_timer, tab->config->export_settle_time, tab->loop);
&& !EMPTY_LIST(tab->exporter.pending))
settle_kick(&tab->export_settle, tab->loop);
tab->nhu_corked = tab->nhu_state;
tab->nhu_state = 0;
@ -3846,9 +3838,7 @@ rt_next_hop_update(struct rtable_private *tab)
/* Finished NHU, cleanup */
rt_trace(tab, D_EVENTS, "NHU done, scheduling export timer");
if (!tm_active(tab->export_timer))
tm_start_in(tab->export_timer, tab->config->export_settle_time, tab->loop);
settle_kick(&tab->export_settle, tab->loop);
/* State change:
* NHU_DIRTY -> NHU_SCHEDULED
@ -3900,6 +3890,10 @@ rt_new_table(struct symbol *s, uint addr_type)
c->gc_period = (uint) -1; /* set in rt_postconfig() */
c->cork_threshold.low = 128;
c->cork_threshold.high = 512;
c->export_settle = (struct settle_config) {
.min = 1 MS,
.max = 100 MS,
};
c->debug = new_config->table_debug;
add_tail(&new_config->tables, &c->n);
@ -4011,6 +4005,8 @@ rt_reconfigure(struct rtable_private *tab, struct rtable_config *new, struct rta
tab->name = new->name;
tab->config = new;
tab->export_settle.cf = new->export_settle;
if (tab->hostcache)
tab->hostcache->req.trace_routes = new->debug;

5
nest/rt.h
View File

@ -20,6 +20,7 @@
#include "lib/event.h"
#include "lib/rcu.h"
#include "lib/io-loop.h"
#include "lib/settle.h"
#include <stdatomic.h>
@ -62,8 +63,8 @@ struct rtable_config {
byte sorted; /* Routes of network are sorted according to rte_better() */
byte trie_used; /* Rtable has attached trie */
byte debug; /* Whether to log */
btime export_settle_time; /* Delay before exports are announced */
struct rt_cork_threshold cork_threshold; /* Cork threshold values */
struct settle_config export_settle; /* Export announcement settler */
};
struct rt_export_hook;
@ -129,7 +130,7 @@ struct rtable_private {
* obstacle from this routing table.
*/
struct event *nhu_uncork_event; /* Helper event to schedule NHU on uncork */
struct timer *export_timer; /* Timer for export batching */
struct settle export_settle; /* Export batching settle timer */
struct timer *prune_timer; /* Timer for periodic pruning / GC */
struct birdloop_flag_handler fh; /* Handler for simple events */
btime last_rt_change; /* Last time when route changed */