From 517e6eccdf6adbcc1307bec0913b5f74a336a37a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Witold=20Kr=C4=99cicki?= <wpk@isc.org>
Date: Tue, 11 Feb 2020 14:41:49 +0100
Subject: [PATCH] use SO_INCOMING_CPU for UDP sockets

---
 lib/isc/netmgr/udp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/isc/netmgr/udp.c b/lib/isc/netmgr/udp.c
index 46219d15bd..823d01b5c1 100644
--- a/lib/isc/netmgr/udp.c
+++ b/lib/isc/netmgr/udp.c
@@ -97,6 +97,10 @@ isc_nm_listenudp(isc_nm_t *mgr, isc_nmiface_t *iface, isc_nm_recv_cb_t cb,
 #endif /* ifdef WIN32 */
 		RUNTIME_CHECK(res == 0);
 
+#ifdef SO_INCOMING_CPU
+		setsockopt(csock->fd, SOL_SOCKET, SO_INCOMING_CPU, &(int){ 1 },
+			   sizeof(int));
+#endif
 		ievent = isc__nm_get_ievent(mgr, netievent_udplisten);
 		ievent->sock = csock;
 		isc__nm_enqueue_ievent(&mgr->workers[i],