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MEDIUM: peers: Balance applets across threads

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When creating a new applet for peer outgoing connection, we check
the load on each thread. Threads with least applet count are
preferred.

With this solution we avoid a situation when many outgoing
connections run on the same thread causing significant load on
single CPU core.
This commit is contained in:
Maciej Zdeb 2022-05-16 17:27:28 +02:00 committed by Christopher Faulet
parent d01be2ab13
commit 34e4085f8a
1 changed files with 6 additions and 5 deletions
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11
src/peers.c
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@ -3196,7 +3196,8 @@ void peers_setup_frontend(struct proxy *fe)
static struct appctx *peer_session_create(struct peers *peers, struct peer *peer)
{
struct appctx *appctx;
unsigned int thr = tid;
unsigned int thr = 0;
int idx;
peer->new_conn++;
peer->reconnect = tick_add(now_ms, MS_TO_TICKS(PEER_RECONNECT_TIMEOUT));
@ -3204,7 +3205,9 @@ static struct appctx *peer_session_create(struct peers *peers, struct peer *peer
peer->statuscode = PEER_SESS_SC_CONNECTCODE;
peer->last_hdshk = now_ms;
appctx = appctx_new_here(&peer_applet, NULL);
for (idx = 0; idx < global.nbthread; idx++)
thr = peers->applet_count[idx] < peers->applet_count[thr] ? idx : thr;
appctx = appctx_new_on(&peer_applet, NULL, thr);
if (!appctx)
goto out_close;
appctx->svcctx = (void *)peer;
@ -3212,10 +3215,8 @@ static struct appctx *peer_session_create(struct peers *peers, struct peer *peer
appctx->st0 = PEER_SESS_ST_CONNECT;
peer->appctx = appctx;
if (appctx_init(appctx) == -1)
goto out_free_appctx;
HA_ATOMIC_INC(&peers->applet_count[thr]);
appctx_wakeup(appctx);
return appctx;
/* Error unrolling */