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BUG/MINOR: tcpcheck: Disable QUICKACK only if data should be sent after connect

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It is only a real problem for agent-checks when there is no agent string to
send. The condition to disable TCP_QUICKACK was only based on the action
type following the connect one. But it is not always accurate. indeed, for
agent-checks, there is always a SEND action. But if there is no "agent-send"
string defined, nothing is sent. In this case, this adds 200ms of latency
with no reason.

To fix the bug, a flag is now used on the CONNECT action to instruct there
are data that should be sent after the connect. For health-checks, this flag
is set if the action following the connect is a SEND action. For
agent-checks, it is set if an "agent-send" string is defined.

This patch should fix the issue #1836. It must be backported as far as 2.2.
This commit is contained in:
Christopher Faulet 2022-08-24 11:38:03 +02:00
parent 6020c4e44e
commit 871dd82117
3 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/haproxy/tcpcheck-t.h
View File

@ -35,6 +35,7 @@
#define TCPCHK_OPT_DEFAULT_CONNECT 0x0008 /* Do a connect using server params */
#define TCPCHK_OPT_IMPLICIT 0x0010 /* Implicit connect */
#define TCPCHK_OPT_SOCKS4 0x0020 /* check the connection via socks4 proxy */
#define TCPCHK_OPT_HAS_DATA 0x0040 /* data should be sent after conncetion */
enum tcpcheck_send_type {
TCPCHK_SEND_UNDEF = 0, /* Send is not parsed. */

7
src/check.c
View File

@ -1688,6 +1688,13 @@ int init_srv_agent_check(struct server *srv)
LIST_INSERT(srv->agent.tcpcheck_rules->list, &chk->list);
}
/* <chk> is always defined here and it is a CONNECT action. If there is
* a preset variable, it means there is an agent string defined and data
* will be sent after the connect.
*/
if (!LIST_ISEMPTY(&srv->agent.tcpcheck_rules->preset_vars))
chk->connect.options |= TCPCHK_OPT_HAS_DATA;
err = init_check(&srv->agent, PR_O2_TCPCHK_CHK);
if (err) {

11
src/tcpcheck.c
View File

@ -1187,10 +1187,8 @@ enum tcpcheck_eval_ret tcpcheck_eval_connect(struct check *check, struct tcpchec
if (proto && proto->connect) {
int flags = 0;
if (check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK)
flags |= CONNECT_HAS_DATA;
if (!next || next->action != TCPCHK_ACT_EXPECT)
flags |= CONNECT_DELACK_ALWAYS;
if (connect->options & TCPCHK_OPT_HAS_DATA)
flags = (CONNECT_HAS_DATA|CONNECT_DELACK_ALWAYS);
status = proto->connect(conn, flags);
}
@ -3737,6 +3735,8 @@ static int check_proxy_tcpcheck(struct proxy *px)
* comment is assigned to the following rule(s).
*/
list_for_each_entry_safe(chk, back, px->tcpcheck_rules.list, list) {
struct tcpcheck_rule *next;
if (chk->action != prev_action && prev_action != TCPCHK_ACT_COMMENT)
ha_free(&comment);
@ -3751,6 +3751,9 @@ static int check_proxy_tcpcheck(struct proxy *px)
case TCPCHK_ACT_CONNECT:
if (!chk->comment && comment)
chk->comment = strdup(comment);
next = get_next_tcpcheck_rule(&px->tcpcheck_rules, chk);
if (next && next->action == TCPCHK_ACT_SEND)
chk->connect.options |= TCPCHK_OPT_HAS_DATA;
/* fall through */
case TCPCHK_ACT_ACTION_KW:
ha_free(&comment);