From: Jens Axboe <axboe@fb.com>
Date: Tue, 15 Dec 2015 02:26:18 +0000 (-0700)
Subject: server: bump listen() backlog
X-Git-Tag: fio-2.3~33^2
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=1e1507dfb10b608bbd46c8bbab6b04118c6f3385

server: bump listen() backlog

With the default if 0, we trigger a lot of these:

[29055.817884] TCP: request_sock_TCP: Possible SYN flooding on port 8765. Sending cookies.  Check SNMP counters.

Set it to 4, even 2 seems to be enough to get rid of it.

Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/server.c b/server.c
index 27ff2854..ca17f9a3 100644
--- a/server.c
+++ b/server.c
@@ -1889,7 +1889,7 @@ static int fio_init_server_connection(void)
 
 	log_info("fio: server listening on %s\n", bind_str);
 
-	if (listen(sk, 0) < 0) {
+	if (listen(sk, 4) < 0) {
 		log_err("fio: listen: %s\n", strerror(errno));
 		close(sk);
 		return -1;