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Nest: Improve GC strategy for rtables

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Use timer (configurable as 'gc period') to schedule routing table
GC/pruning to ensure that prune is done on time but not too often.

Randomize GC timers to avoid concentration of GC events from different
tables in one loop cycle.

Fix a bug that caused minimum inter-GC interval be 5 us instead of 5 s.

Make default 'gc period' adaptive based on number of routing tables,
from 10 s for small setups to 600 s for large ones.

In marge multi-table RS setup, the patch improved time of flushing
a downed peer from 20-30 min to <2 min and removed 40s latencies.
This commit is contained in:
Ondrej Zajicek
2022-06-04 17:34:57 +02:00
parent 9e60b500c7
commit a8a3d95be5
5 changed files with 70 additions and 12 deletions
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8
nest/route.h
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@@ -148,8 +148,8 @@ struct rtable_config {
struct rtable *table;
struct proto_config *krt_attached; /* Kernel syncer attached to this table */
uint addr_type; /* Type of address data stored in table (NET_*) */
int gc_max_ops; /* Maximum number of operations before GC is run */
int gc_min_time; /* Minimum time between two consecutive GC runs */
uint gc_threshold; /* Maximum number of operations before GC is run */
uint gc_period; /* Approximate time between two consecutive GC runs */
byte sorted; /* Routes of network are sorted according to rte_better() */
byte internal; /* Internal table of a protocol */
byte trie_used; /* Rtable has attached trie */
@@ -180,10 +180,11 @@ typedef struct rtable {
* obstacle from this routing table.
*/
struct event *rt_event; /* Routing table event */
struct timer *prune_timer; /* Timer for periodic pruning / GC */
btime last_rt_change; /* Last time when route changed */
btime base_settle_time; /* Start time of rtable settling interval */
btime gc_time; /* Time of last GC */
int gc_counter; /* Number of operations since last GC */
uint gc_counter; /* Number of operations since last GC */
byte prune_state; /* Table prune state, 1 -> scheduled, 2-> running */
byte prune_trie; /* Prune prefix trie during next table prune */
byte hcu_scheduled; /* Hostcache update is scheduled */
@@ -332,6 +333,7 @@ struct config;
void rt_init(void);
void rt_preconfig(struct config *);
void rt_postconfig(struct config *);
void rt_commit(struct config *new, struct config *old);
void rt_lock_table(rtable *);
void rt_unlock_table(rtable *);