From owner-cvs-src-old@FreeBSD.ORG  Mon Oct 27 06:25:08 2008
Return-Path: <owner-cvs-src-old@FreeBSD.ORG>
Delivered-To: cvs-src-old@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 115571065675
	for <cvs-src-old@freebsd.org>; Mon, 27 Oct 2008 06:25:08 +0000 (UTC)
	(envelope-from sobomax@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id F3B168FC19
	for <cvs-src-old@freebsd.org>; Mon, 27 Oct 2008 06:25:07 +0000 (UTC)
	(envelope-from sobomax@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.3/8.14.3) with ESMTP id m9R6P7DS047097
	for <cvs-src-old@freebsd.org>; Mon, 27 Oct 2008 06:25:07 GMT
	(envelope-from sobomax@repoman.freebsd.org)
Received: (from svn2cvs@localhost)
	by repoman.freebsd.org (8.14.3/8.14.3/Submit) id m9R6P7q1047096
	for cvs-src-old@freebsd.org; Mon, 27 Oct 2008 06:25:07 GMT
	(envelope-from sobomax@repoman.freebsd.org)
Message-Id: <200810270625.m9R6P7q1047096@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to
	sobomax@repoman.freebsd.org using -f
From: Maxim Sobolev <sobomax@FreeBSD.org>
Date: Mon, 27 Oct 2008 06:25:02 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/kern subr_param.c
X-BeenThere: cvs-src-old@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: **OBSOLETE** CVS commit messages for the src tree
	<cvs-src-old.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src-old>
List-Post: <mailto:cvs-src-old@freebsd.org>
List-Help: <mailto:cvs-src-old-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 27 Oct 2008 06:25:08 -0000

sobomax     2008-10-27 06:25:02 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_param.c 
  Log:
  SVN rev 184323 on 2008-10-27 06:25:02Z by sobomax
  
  Default HZ value (1,000) on i386/amd64 is not very virtual machine friendly.
  Due to the nature of the beast it causes lot of unproductive overhead. This
  is especially bad when running SMP kernel on VMWare with several virtual
  processors - idle FreeBSD guest with SMP kernel takes 150% host CPU time on my
  dual-core MacBook Pro when I am enabling two virtual CPUs, making even host
  not very usable. Detect when we are running in the sandbox and reduce HZ
  to 10 (can be adjusted via VM_HZ in the kernel config) in such cases. This
  brings host CPU usage of idle FreeBSD/SMP on two virtual processors down
  to 10%.
  
  Detect most popular VM platforms out there - VMWare, Parallels, VirtualBox
  and VirtualPC.
  
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.77      +39 -1     src/sys/kern/subr_param.c