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Message-ID: <46152CA4.9000601@amd.com> Date: Thu, 05 Apr 2007 19:06:44 +0200 From: "Markus Rechberger" <markus.rechberger@....com> To: "H. Peter Anvin" <hpa@...or.com> cc: "Andreas Herrmann" <andreas.herrmann3@....com>, "Andi Kleen" <ak@...e.de>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] x86: limit mwait_idle to Intel CPUs H. Peter Anvin wrote: > Andreas Herrmann wrote: >> >> It is not equivalent. Usually users check /proc/cpuinfo for their >> CPU features. Deleting that flag is kind of obfuscation. >> >> I guess some time ago people did not care about their "svm" or "vmx" >> flags. Nowadays (e.g. with kvm) some people are quite happy >> if one of those strings occurs in /proc/cpuinfo (and they are quite >> disappointed if this feature was disabled by BIOS). >> > > What you're saying is that you want it to appear in /proc/cpuinfo for > marketing reasons even though it's not usable. > > The ones in /proc/cpuinfo are cooked values anyway; there is plenty of > history to that effect. > > I would agree with Andi that if as far as Linux is concerned mwait is > unusable on AMD Fam10 processors, then the CPU detection code should > turn this bit off on AMD Fam10 processors. > please see: http://kvm.qumranet.com/kvmwiki/FAQ "How can I tell if I have Intel VT or AMD-V?" Markus -- Markus Rechberger Operating System Research Center AMD Saxony LLC & Co. KG - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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