From owner-svn-src-all@FreeBSD.ORG Tue Oct 21 01:08:23 2008 Return-Path: Delivered-To: svn-src-all@FreeBSD.org Received: from [127.0.0.1] (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by hub.freebsd.org (Postfix) with ESMTP id 59AF41065671; Tue, 21 Oct 2008 01:08:22 +0000 (UTC) (envelope-from jkim@FreeBSD.org) From: Jung-uk Kim To: src-committers@FreeBSD.org Date: Mon, 20 Oct 2008 21:08:03 -0400 User-Agent: KMail/1.6.2 References: <200810210038.m9L0c0w1084560@svn.freebsd.org> In-Reply-To: <200810210038.m9L0c0w1084560@svn.freebsd.org> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200810202108.08496.jkim@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org Subject: Re: svn commit: r184102 - in head/sys: amd64/amd64 amd64/include contrib/altq/altq i386/i386 i386/include i386/isa X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Oct 2008 01:08:23 -0000 On Monday 20 October 2008 08:38 pm, Jung-uk Kim wrote: > Author: jkim > Date: Tue Oct 21 00:38:00 2008 > New Revision: 184102 > URL: http://svn.freebsd.org/changeset/base/184102 > > Log: > Turn off CPU frequency change notifiers when the TSC is P-state > invariant or it is forced by setting > 'kern.timecounter.invariant_tsc' tunable to non-zero. I believe recent Intel CPUs also have P-state invariant TSCs and I saw some people reported issues with them as well. In fact, I bought a new AMD CPU and it has P-state invariant TSC. But the CPU ID wasn't set. I heard BIOS wouldn't set it if all cores are not synchronized. So, I had to force it with the tunable. :-( Jung-uk Kim