Date: Mon, 13 Jan 2014 14:23:48 +0000 From: Alexey Dokuchaev <danfe@FreeBSD.org> To: Alexander Motin <mav@FreeBSD.org> Cc: svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-stable-9@freebsd.org Subject: Re: svn commit: r260474 - stable/9/sys/x86/cpufreq Message-ID: <20140113142347.GA96299@FreeBSD.org> In-Reply-To: <201401091045.s09AjcFi083701@svn.freebsd.org> References: <201401091045.s09AjcFi083701@svn.freebsd.org>
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On Thu, Jan 09, 2014 at 10:45:38AM +0000, Alexander Motin wrote: > New Revision: 260474 > URL: http://svnweb.freebsd.org/changeset/base/260474 > > Log: > MFC r259197: > Do not DELAY() for P-state transition unless we want to see the result. > > Intel manual says: "If a transition is already in progress, transition to > a new value will subsequently take effect. Reads of IA32_PERF_CTL determine > the last targeted operating point." So seems it should be fine to just > trigger wanted transition and go. Linux does the same. > > Modified: > stable/9/sys/x86/cpufreq/est.c It looks like stable/8 can also benefit from this commit. Mind making one? ./danfe
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