From owner-svn-src-head@freebsd.org  Thu Oct  5 11:36:56 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 44753E359E3;
 Thu,  5 Oct 2017 11:36:56 +0000 (UTC) (envelope-from kib@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 125996CAA0;
 Thu,  5 Oct 2017 11:36:56 +0000 (UTC) (envelope-from kib@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v95BatSB018482;
 Thu, 5 Oct 2017 11:36:55 GMT (envelope-from kib@FreeBSD.org)
Received: (from kib@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v95Bat8Z018481;
 Thu, 5 Oct 2017 11:36:55 GMT (envelope-from kib@FreeBSD.org)
Message-Id: <201710051136.v95Bat8Z018481@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org
 using -f
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 5 Oct 2017 11:36:55 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r324302 - head/sys/amd64/amd64
X-SVN-Group: head
X-SVN-Commit-Author: kib
X-SVN-Commit-Paths: head/sys/amd64/amd64
X-SVN-Commit-Revision: 324302
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: 2.1.23
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: Thu, 05 Oct 2017 11:36:56 -0000

Author: kib
Date: Thu Oct  5 11:36:55 2017
New Revision: 324302
URL: https://svnweb.freebsd.org/changeset/base/324302

Log:
  Reduce default max_ldt_segment value to 512.
  
  This makes the LDT to use only one page with default settings,
  avoiding the need to find contigous 2 pages in KVA.  It seems that
  most users are fine even with 512 segments.
  
  Discussed with:	bde
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/amd64/amd64/sys_machdep.c

Modified: head/sys/amd64/amd64/sys_machdep.c
==============================================================================
--- head/sys/amd64/amd64/sys_machdep.c	Thu Oct  5 11:34:51 2017	(r324301)
+++ head/sys/amd64/amd64/sys_machdep.c	Thu Oct  5 11:36:55 2017	(r324302)
@@ -64,7 +64,7 @@ __FBSDID("$FreeBSD$");
 
 #define	MAX_LD		8192
 
-int max_ldt_segment = 1024;
+int max_ldt_segment = 512;
 SYSCTL_INT(_machdep, OID_AUTO, max_ldt_segment, CTLFLAG_RDTUN,
     &max_ldt_segment, 0,
     "Maximum number of allowed LDT segments in the single address space");