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BUG/MINOR: listener: keep accept rate counters accurate under saturation

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The test on l->nbconn forces to exit the loop before updating the freq
counters, so the last session which reaches a listener's limit will not
be accounted for in the session rate measurement.

Let's move the test at the beginning of the loop and mark the listener
as saturated on exit.

This may be backported to 1.9 and 1.8.
This commit is contained in:
Willy Tarreau 2019-02-25 15:02:04 +01:00
parent 12a718488a
commit 741b4d6b7a
1 changed files with 4 additions and 11 deletions
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15
src/listener.c
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@ -464,11 +464,6 @@ void listener_accept(int fd)
if (HA_SPIN_TRYLOCK(LISTENER_LOCK, &l->lock))
return;
if (unlikely(l->nbconn >= l->maxconn)) {
listener_full(l);
goto end;
}
if (!(l->options & LI_O_UNLIMITED) && global.sps_lim) {
int max = freq_ctr_remain(&global.sess_per_sec, global.sps_lim, 0);
@ -527,7 +522,7 @@ void listener_accept(int fd)
* worst case. If we fail due to system limits or temporary resource
* shortage, we try again 100ms later in the worst case.
*/
while (max_accept--) {
while (l->nbconn < l->maxconn && max_accept--) {
struct sockaddr_storage addr;
socklen_t laddr = sizeof(addr);
unsigned int count;
@ -647,11 +642,6 @@ void listener_accept(int fd)
goto transient_error;
}
if (l->nbconn >= l->maxconn) {
listener_full(l);
goto end;
}
/* increase the per-process number of cumulated connections */
if (!(l->options & LI_O_UNLIMITED)) {
count = update_freq_ctr(&global.sess_per_sec, 1);
@ -679,6 +669,9 @@ void listener_accept(int fd)
limit_listener(l, &global_listener_queue);
task_schedule(global_listener_queue_task, tick_first(expire, global_listener_queue_task->expire));
end:
if (l->nbconn >= l->maxconn)
listener_full(l);
HA_SPIN_UNLOCK(LISTENER_LOCK, &l->lock);
}