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[OPTIM] maintain_proxies: only wake up when the frontend will be ready

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It's not needed to try to check the frontend's freq counter every
millisecond, we can precisely compute when to wake up.
This commit is contained in:
Willy Tarreau 2009-03-06 08:27:10 +01:00
parent bb9251ed8f
commit efcbc6e66d
1 changed files with 6 additions and 3 deletions
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9
src/proxy.c
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@ -383,10 +383,13 @@ void maintain_proxies(int *next)
if (p->fe_maxsps && read_freq_ctr(&p->fe_sess_per_sec) >= p->fe_maxsps) {
/* we're blocking because a limit was reached on the number of
* requests/s on the frontend. We want to re-check ASAP, which
* means in 1 ms because the timer will have settled down. Note
* that we may already be in IDLE state here.
* means in 1 ms before estimated expiration date, because the
* timer will have settled down. Note that we may already be in
* IDLE state here.
*/
*next = tick_first(*next, tick_add(now_ms, 1));
int wait = 1000 / p->fe_maxsps - 1;
wait = MAX(wait, 1);
*next = tick_first(*next, tick_add(now_ms, wait));
goto do_block;
}