svn commit: r334116 - head/sys/netinet

[Matt Macy]

Author: mmacy
Date: Wed May 23 20:50:09 2018
New Revision: 334116
URL: https://svnweb.freebsd.org/changeset/base/334116

Log:
  udp: assign flowid to udp sockets round-robin
  
  On a 2x8x2 SKL this increases measured throughput with 64
  netperf -H $DUT -t UDP_STREAM -- -m 1
  
  from 590kpps to 1.1Mpps
  before:
  https://people.freebsd.org/~mmacy/2018.05.11/udpsender.svg
  after:
  https://people.freebsd.org/~mmacy/2018.05.11/udpsender2.svg

Modified:
  head/sys/netinet/udp_usrreq.c

Modified: head/sys/netinet/udp_usrreq.c
==============================================================================
--- head/sys/netinet/udp_usrreq.c	Wed May 23 20:06:04 2018	(r334115)
+++ head/sys/netinet/udp_usrreq.c	Wed May 23 20:50:09 2018	(r334116)
@@ -1565,6 +1565,7 @@ udp_abort(struct socket *so)
 static int
 udp_attach(struct socket *so, int proto, struct thread *td)
 {
+	static uint32_t udp_flowid;
 	struct inpcb *inp;
 	struct inpcbinfo *pcbinfo;
 	int error;
@@ -1585,6 +1586,8 @@ udp_attach(struct socket *so, int proto, struct thread
 	inp = sotoinpcb(so);
 	inp->inp_vflag |= INP_IPV4;
 	inp->inp_ip_ttl = V_ip_defttl;
+	inp->inp_flowid = atomic_fetchadd_int(&udp_flowid, 1);
+	inp->inp_flowtype = M_HASHTYPE_OPAQUE;
 
 	error = udp_newudpcb(inp);
 	if (error) {