From owner-svn-src-head@freebsd.org  Sat Nov 25 22:01:57 2017
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 23DD4DF15F0;
 Sat, 25 Nov 2017 22:01:57 +0000 (UTC)
 (envelope-from nwhitehorn@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id E234D706C3;
 Sat, 25 Nov 2017 22:01:56 +0000 (UTC)
 (envelope-from nwhitehorn@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id vAPM1tE3059951;
 Sat, 25 Nov 2017 22:01:55 GMT (envelope-from nwhitehorn@FreeBSD.org)
Received: (from nwhitehorn@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id vAPM1tjj059950;
 Sat, 25 Nov 2017 22:01:55 GMT (envelope-from nwhitehorn@FreeBSD.org)
Message-Id: <201711252201.vAPM1tjj059950@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: nwhitehorn set sender to
 nwhitehorn@FreeBSD.org using -f
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sat, 25 Nov 2017 22:01:55 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r326206 - head/sys/powerpc/powerpc
X-SVN-Group: head
X-SVN-Commit-Author: nwhitehorn
X-SVN-Commit-Paths: head/sys/powerpc/powerpc
X-SVN-Commit-Revision: 326206
X-SVN-Commit-Repository: base
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.25
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 25 Nov 2017 22:01:57 -0000

Author: nwhitehorn
Date: Sat Nov 25 22:01:55 2017
New Revision: 326206
URL: https://svnweb.freebsd.org/changeset/base/326206

Log:
  Yield while spinning on APs and avoid announcing all CPUs unless bootverbose
  is set. These improve startup performance on massively multithreaded systems
  with 8-way SMT and dozens to hundreds of CPUs.
  
  MFC after:	3 weeks

Modified:
  head/sys/powerpc/powerpc/mp_machdep.c

Modified: head/sys/powerpc/powerpc/mp_machdep.c
==============================================================================
--- head/sys/powerpc/powerpc/mp_machdep.c	Sat Nov 25 21:59:59 2017	(r326205)
+++ head/sys/powerpc/powerpc/mp_machdep.c	Sat Nov 25 22:01:55 2017	(r326206)
@@ -78,7 +78,8 @@ machdep_ap_bootstrap(void)
 	__asm __volatile("msync; isync");
 
 	while (ap_letgo == 0)
-		;
+		__asm __volatile("or 27,27,27");
+	__asm __volatile("or 6,6,6");
 
 	/* Initialize DEC and TB, sync with the BSP values */
 	platform_smp_timebase_sync(ap_timebase, 1);
@@ -176,6 +177,9 @@ cpu_mp_announce(void)
 {
 	struct pcpu *pc;
 	int i;
+
+	if (!bootverbose)
+		return;
 
 	CPU_FOREACH(i) {
 		pc = pcpu_find(i);