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Rate-limit scheduling of work-events

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In general, events are code handling some some condition, which is
scheduled when such condition happened and executed independently from
I/O loop. Work-events are a subgroup of events that are scheduled
repeatedly until some (often significant) work is done (e.g. feeding
routes to protocol). All scheduled events are executed during each
I/O loop iteration.

Separate work-events from regular events to a separate queue and
rate limit their execution to a fixed number per I/O loop iteration.
That should prevent excess latency when many work-events are
scheduled at one time (e.g. simultaneous reload of many BGP sessions).
This commit is contained in:
Ondrej Zajicek (work)
2021-03-12 15:35:56 +01:00
parent 9cf3d53311
commit 7be3af7fa6
4 changed files with 66 additions and 6 deletions
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3
sysdep/unix/io.c
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@@ -2161,6 +2161,7 @@ io_init(void)
{
init_list(&sock_list);
init_list(&global_event_list);
init_list(&global_work_list);
krt_io_init();
// XXX init_times();
// XXX update_times();
@@ -2172,6 +2173,7 @@ io_init(void)
static int short_loops = 0;
#define SHORT_LOOP_MAX 10
#define WORK_EVENTS_MAX 10
void
io_loop(void)
@@ -2189,6 +2191,7 @@ io_loop(void)
{
times_update(&main_timeloop);
events = ev_run_list(&global_event_list);
events = ev_run_list_limited(&global_work_list, WORK_EVENTS_MAX) || events;
timers_fire(&main_timeloop);
io_close_event();