From owner-freebsd-questions@FreeBSD.ORG Sat Nov 9 09:25:40 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id E2E61D66 for ; Sat, 9 Nov 2013 09:25:40 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-qe0-x229.google.com (mail-qe0-x229.google.com [IPv6:2607:f8b0:400d:c02::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id A36CD2383 for ; Sat, 9 Nov 2013 09:25:40 +0000 (UTC) Received: by mail-qe0-f41.google.com with SMTP id x7so2946756qeu.14 for ; Sat, 09 Nov 2013 01:25:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=MtPRh9zthVwFO+5CH2cYAT/t0ZpMzog8j463F8lIoSI=; b=UgDpMxYTJZSr6SlyJ9Ua5qlLFcfurkmKwCy9nRluKnbWjq6iPOwjTQeEKhs9sz+dw1 p8UhES93xWnkGkMUOv9SQW3JskcJ0PzUWvZYCK2pU4Whyu732HREmc0nqcTI8ACAIApu JPe/lSvODs4rl4NaiCT7E63i5VzcXVCjeVz0IGP1iuPC/expAVfw+kSErCpxw3CYvEdv lhJct9xX82O1rUbJl7deW5YB3wXJmJVW0Kj0HxYXaL/rLXbRgTFLJaNtBWaUB2RxA5Tu 2qwdP/VzQyq+vFoYiIC0EWKqCEf6sSmIR2R+Ym2OPZBL128H9h5CNCXxu2s7OkO36Yel 5Xcw== MIME-Version: 1.0 X-Received: by 10.49.19.101 with SMTP id d5mr29148542qee.78.1383989139941; Sat, 09 Nov 2013 01:25:39 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.224.207.66 with HTTP; Sat, 9 Nov 2013 01:25:39 -0800 (PST) In-Reply-To: References: <70EC0F10-FAD0-4EA6-8C1F-A95B1C786B7B@gmail.com> <20131031153757.GG63947@dan.emsphone.com> <4A2AEF45-5185-4ED7-98BD-B6975C79A5B9@gmail.com> Date: Sat, 9 Nov 2013 01:25:39 -0800 X-Google-Sender-Auth: pIXQdIFEY3Rk72ejcsFVWVKSolQ Message-ID: Subject: Re: CPU Turbo mode From: Adrian Chadd To: Warren Block Content-Type: text/plain; charset=ISO-8859-1 Cc: Dan Nelson , FreeBSD Mailing List , aurfalien X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 Nov 2013 09:25:40 -0000 On 8 November 2013 16:08, Warren Block wrote: > When it shows 2201, it's in Turbo mode. I don't know if there is anywhere > that shows the actual speed of the single core that is going faster. I enabled this on a 4-core sandy bridge (E3-1260L IIRC) and all four cores suddenly grew a few % more clock cycles. But, it was on a server whose fans are cranked high anyway, so the CPU temperature only grew a degree or two. I think Turbo Boost is boosting all cores that have work on it; it's up to the thread/process scheduler to keep the thermal envelope such that the overclocking works. -adrian