From owner-p4-projects@FreeBSD.ORG  Sat Sep 29 22:28:06 2007
Return-Path: <owner-p4-projects@FreeBSD.ORG>
Delivered-To: p4-projects@freebsd.org
Received: by hub.freebsd.org (Postfix, from userid 32767)
	id AC87616A420; Sat, 29 Sep 2007 22:28:06 +0000 (UTC)
Delivered-To: perforce@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 71B9016A419
	for <perforce@freebsd.org>; Sat, 29 Sep 2007 22:28:06 +0000 (UTC)
	(envelope-from kmacy@freebsd.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id 624C513C44B
	for <perforce@freebsd.org>; Sat, 29 Sep 2007 22:28:06 +0000 (UTC)
	(envelope-from kmacy@freebsd.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.1/8.14.1) with ESMTP id l8TMS6Gd050099
	for <perforce@freebsd.org>; Sat, 29 Sep 2007 22:28:06 GMT
	(envelope-from kmacy@freebsd.org)
Received: (from perforce@localhost)
	by repoman.freebsd.org (8.14.1/8.14.1/Submit) id l8TMS6hV050096
	for perforce@freebsd.org; Sat, 29 Sep 2007 22:28:06 GMT
	(envelope-from kmacy@freebsd.org)
Date: Sat, 29 Sep 2007 22:28:06 GMT
Message-Id: <200709292228.l8TMS6hV050096@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: perforce set sender to
	kmacy@freebsd.org using -f
From: Kip Macy <kmacy@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Cc: 
Subject: PERFORCE change 126992 for review
X-BeenThere: p4-projects@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: p4 projects tree changes <p4-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/p4-projects>
List-Post: <mailto:p4-projects@freebsd.org>
List-Help: <mailto:p4-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 29 Sep 2007 22:28:07 -0000

http://perforce.freebsd.org/chv.cgi?CH=126992

Change 126992 by kmacy@kmacy_home:ethng on 2007/09/29 22:27:17

	use simple lfsr to provide more uniform txq assignment for udp sessions

Affected files ...

.. //depot/projects/ethng/src/sys/netinet/in_pcb.c#5 edit

Differences ...

==== //depot/projects/ethng/src/sys/netinet/in_pcb.c#5 (text+ko) ====

@@ -158,6 +158,13 @@
 	   &ipport_randomtime, 0, "Minimum time to keep sequental port "
 	   "allocation before switching to a random one");
 
+
+static __inline int
+calc_lfsr(int lfsr)
+{
+	return ((lfsr >> 1) ^ (-(signed int)(lfsr & 1) & 0xd0000001u)); /* taps 32 31 29 1 */
+}
+
 /*
  * in_pcb.c: manage the Protocol Control Blocks.
  *
@@ -185,7 +192,7 @@
 	bzero(inp, inp_zero_size);
 	inp->inp_pcbinfo = pcbinfo;
 	inp->inp_socket = so;
-	inp->inp_rss_hash = rss_hash++;
+	inp->inp_rss_hash = calc_lfsr(rss_hash++);
 #ifdef MAC
 	error = mac_init_inpcb(inp, M_NOWAIT);
 	if (error != 0)