Date: Fri, 22 May 2015 11:47:58 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Stefan Esser <se@freebsd.org> Cc: Nikos Vassiliadis <nvass@gmx.com>, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: CPU frequency doesn't drop below 1200MHz (like it used to) Message-ID: <CAJ-VmonFPhwh_4oT_adCTXo%2B50AcgUug5PRTfaktjLoz-9gN7g@mail.gmail.com> In-Reply-To: <555F7599.5000605@freebsd.org> References: <555C71C8.4080007@gmx.com> <555EDBBB.4090107@gmx.com> <555F7599.5000605@freebsd.org>
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Hi, The whole point of throttling on modern hardware isn't to get really low clock rates, it's to deal with being out of thermal envelope. But, the modern intel cores will do that for you without OS involvement. So, you don't have to actually use p4tcc and it may actually configure your hardware wrong. Just throttle down to 1200MHz and go into deeper sleep states (>C1). I checked this on a variety of older and modern hardware; they all worked better just doing lowest ACPI P state and lowest ACPI C state. -adrian
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