From owner-freebsd-current@FreeBSD.ORG Mon Mar 12 19:55:31 2012 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 72081106564A; Mon, 12 Mar 2012 19:55:31 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from mail-wi0-f178.google.com (mail-wi0-f178.google.com [209.85.212.178]) by mx1.freebsd.org (Postfix) with ESMTP id CAD1F8FC15; Mon, 12 Mar 2012 19:55:30 +0000 (UTC) Received: by wibhq7 with SMTP id hq7so3495242wib.13 for ; Mon, 12 Mar 2012 12:55:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=WMF10BYiXm85ixEabMkAJoxc/0s3cccjzBtwhKOxd+I=; b=vN9z0HuX6bWcz54oCAkW3vI9+t4NjPmqh71gWZZpppGQ8nsEopzPoh9Vdiuy1O+nPl pLMov6zTRsNb7gzLUcbe0BDT7ZNPXI0OQl1b2YPtIrWOC/uEcyc3IgLeEioEo+imsKwd VnOjy40FIFJaxDu1r7M7/77zyiDE8z6o7tvdK6Q3em8LqMAM7mQ9mayqewosv4oBqFBp edhZqxUcO9VTddPV0E8Qaguu8PGNwwLLqFxdqB2fQ2jfWni/4WXTHvDVPpTtnrxeuiVs wBVTqnvmrGG25WnoNXWzktiVpscC+AopiBoq3GksW42NE2Yqm8XCcYrQdYLWJ2hJcuuW axDQ== Received: by 10.180.102.231 with SMTP id fr7mr818723wib.10.1331582124362; Mon, 12 Mar 2012 12:55:24 -0700 (PDT) Received: from mavbook2.mavhome.dp.ua (pc.mavhome.dp.ua. [212.86.226.226]) by mx.google.com with ESMTPS id t20sm62310278wiv.0.2012.03.12.12.55.22 (version=SSLv3 cipher=OTHER); Mon, 12 Mar 2012 12:55:23 -0700 (PDT) Sender: Alexander Motin Message-ID: <4F5E54A9.5050301@FreeBSD.org> Date: Mon, 12 Mar 2012 21:55:21 +0200 From: Alexander Motin User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0.2) Gecko/20120226 Thunderbird/10.0.2 MIME-Version: 1.0 To: Ivan Klymenko References: <4F5E4B57.1050605@FreeBSD.org> <4f5e4f82.41972a0a.0e49.2cfdSMTPIN_ADDED@mx.google.com> In-Reply-To: <4f5e4f82.41972a0a.0e49.2cfdSMTPIN_ADDED@mx.google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Cc: freebsd-performance@FreeBSD.org, FreeBSD current Subject: Re: Improved Intel Turbo Boost status/control X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Mar 2012 19:55:31 -0000 On 03/12/12 21:33, Ivan Klymenko wrote: > В Mon, 12 Mar 2012 21:15:35 +0200 > Alexander Motin пишет: >> I'd like to note that recent r232793 change to cpufreq(4) in HEAD >> opened simple access to the Intel Turbo Boost status/control. I've >> found that at least two of my desktop systems (based Nehalem and >> SandyBridge Core i7s) with enabled Intel Turbo Boost in BIOS it is >> not use it by default, unless powerd is enabled. And before this >> change it was difficult to detect/fix. >> >> ACPI reports extra performance level with frequency 1MHz above the >> nominal to control Intel Turbo Boost operation. It is not a bug, but >> feature: >> dev.cpu.0.freq_levels: 2934/106000 2933/95000 2800/82000 ... >> In this case value 2933 means 2.93GHz, but 2934 means 3.2-3.6GHz. >> >> After boot with default settings I see: >> dev.cpu.0.freq: 2933 >> , that means Turbo Boost is disabled. >> >> Enabling powerd or just adding to rc.conf >> performance_cpu_freq="HIGH" >> enables Turbo Boost and adds extra 10-20% to the system performance. >> >> Turbo Boost operation can be monitored in run-time via the PMC with >> command that prints number or really executed cycles per CPU core: >> pmcstat -s unhalted-core-cycles -w 1 >> > > Thank you very much! > performance_cpu_freq="HIGH" > and as this option must be combined with state of the processor C1 C2 > C3? > performance_cx_lowest="XX" > economy_cx_lowest="XX" The more CPU cores on package are sleeping and the deeper they are sleeping, the bigger will be boost for remaining active cores. Without using deeper C-states boost is usually quite small (about 100-200MHz for desktop chips). Enabling C-states increases it in few times. -- Alexander Motin