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From: Robert Watson <rwatson@FreeBSD.org>
Date: Sat, 28 Mar 2009 16:12:32 +0000 (UTC)
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Subject: svn commit: r190506 - stable/7/sys/netinet
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Author: rwatson
Date: Sat Mar 28 16:12:32 2009
New Revision: 190506
URL: http://svn.freebsd.org/changeset/base/190506

Log:
  Enable soreceive_dgram() use by UDP by default in 7.x.  This can lead
  to a significant performance improvement for multi-threaded UDP socket
  receive, such as found in BIND, memcached, VoIP applications, etc.
  
  Requested by:	Florian Smeets <flo at kasimir.com>
  Approved by:	re (kib)

Modified:
  stable/7/sys/netinet/udp_usrreq.c

Modified: stable/7/sys/netinet/udp_usrreq.c
==============================================================================
--- stable/7/sys/netinet/udp_usrreq.c	Sat Mar 28 15:54:08 2009	(r190505)
+++ stable/7/sys/netinet/udp_usrreq.c	Sat Mar 28 16:12:32 2009	(r190506)
@@ -131,7 +131,7 @@ u_long	udp_recvspace = 40 * (1024 +
 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 
-static int udp_soreceive_dgram;
+static int udp_soreceive_dgram = 1;
 SYSCTL_INT(_net_inet_udp, OID_AUTO, soreceive_dgram_enabled,
     CTLFLAG_RD | CTLFLAG_TUN, &udp_soreceive_dgram, 0,
     "Use experimental optimized datagram receive");