Date: Mon, 20 Oct 2008 21:08:03 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: src-committers@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 Message-ID: <200810202108.08496.jkim@FreeBSD.org> In-Reply-To: <200810210038.m9L0c0w1084560@svn.freebsd.org> References: <200810210038.m9L0c0w1084560@svn.freebsd.org>
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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
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