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KRT: Scan routing tables separetely on linux to avoid congestion

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Remove compile-time sysdep option CONFIG_ALL_TABLES_AT_ONCE, replace it
with runtime ability to run either separate table scans or shared scan.

On Linux, use separate table scans by default when the netlink socket
option NETLINK_GET_STRICT_CHK is available, but retreat to shared scan
when it fails.

Running separate table scans has advantages where some routing tables are
managed independently, e.g. when multiple routing daemons are running on
the same machine, as kernel routing table modification performance is
significantly reduced when the table is modified while it is being
scanned.

Thanks Daniel Gröber for the original patch and Toke Høiland-Jørgensen
for suggestions.
This commit is contained in:
Ondrej Zajicek
2022-07-24 02:15:20 +02:00
parent 971721c9b5
commit 534d0a4b44
5 changed files with 78 additions and 49 deletions
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4
sysdep/unix/krt.h
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@@ -52,10 +52,7 @@ struct krt_proto {
struct rtable *krt_table; /* Internal table of inherited routes */
#endif
#ifndef CONFIG_ALL_TABLES_AT_ONCE
timer *scan_timer;
#endif
struct bmap sync_map; /* Keeps track which exported routes were successfully written to kernel */
struct bmap seen_map; /* Routes seen during last periodic scan */
node krt_node; /* Node in krt_proto_list */
@@ -76,6 +73,7 @@ extern pool *krt_pool;
struct proto_config * kif_init_config(int class);
void kif_request_scan(void);
void krt_use_shared_scan(void);
void krt_got_route(struct krt_proto *p, struct rte *e);
void krt_got_route_async(struct krt_proto *p, struct rte *e, int new);