From owner-freebsd-current@FreeBSD.ORG Sat Jan 12 23:26:49 2008 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 54F5416A419 for ; Sat, 12 Jan 2008 23:26:49 +0000 (UTC) (envelope-from mozolevsky@gmail.com) Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.168]) by mx1.freebsd.org (Postfix) with ESMTP id B99E813C45A for ; Sat, 12 Jan 2008 23:26:48 +0000 (UTC) (envelope-from mozolevsky@gmail.com) Received: by ug-out-1314.google.com with SMTP id y2so947252uge.37 for ; Sat, 12 Jan 2008 15:26:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; bh=K/338RvCIQnRBy7zFnrB1TtLSpRzrLo9O/dzyXboStE=; b=IEijyE4gn4blnkxeTCMGTHJJBOaNp7CBC82BLZcvG//oGTUfZj6kuy3/08UMmDD1xhInNIRsllRDoxtXa8/DwxMzMt36SZ1UxhkHyh9lCcrzSWCNaLehFGTbquiZMxr63KJYyq4pFjH+aks7wYnR3RGf5BdWAa893b3HA0/AIxY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=rw6o8t0t8D/c3qCRg0nriTCDs6q1pEH35ZeIGJsaB+ZPxUDm8bcbFEyEyQg+sB2pw+jqvZyC41ecDFEpsO1dcPF663UfNrWPZb74gpoEe8Mc9bPci9RptfjTdPc7dM1Os9JMQE9g4Yi42YQZs1rJHwxmNwgGUBJyzcd702sWBgQ= Received: by 10.66.240.12 with SMTP id n12mr1227722ugh.9.1200180407244; Sat, 12 Jan 2008 15:26:47 -0800 (PST) Received: by 10.66.248.11 with HTTP; Sat, 12 Jan 2008 15:26:47 -0800 (PST) Message-ID: Date: Sat, 12 Jan 2008 23:26:47 +0000 From: "Igor Mozolevsky" Sender: mozolevsky@gmail.com To: "Maxim Sobolev" In-Reply-To: <478930D2.90806@digifonica.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20080111181344.5E7244500E@ptavv.es.net> <478930D2.90806@digifonica.com> X-Google-Sender-Auth: 6e3af68919fe2b43 Cc: njl@freebsd.org, bruno@freebsd.org, Stefan Lambrev , freebsd-current@freebsd.org, =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= Subject: Re: powerd adaptive mode latching 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: Sat, 12 Jan 2008 23:26:49 -0000 On 12/01/2008, Maxim Sobolev wrote: > I wonder if somebody did measurement of power consumption with powerd > and without it on typical tasks. There is very interesting idea in the > last issue of ACM Queue that it might be much more beneficial to run CPU > at the full speed and then switch it to low-power mode as soon as > possible in the idle loop than to run longer at reduced speed for a > longer period of time. That's a pretty neat idea, and will certainly get rid of the polling issue. The scheduler could scale the cpu clock, but I presume it would require some hacking effort... Igor