From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 15 Nov 2000 16:34:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 15 Nov 2000 16:34:12 -0500 Received: from [194.213.32.137] ([194.213.32.137]:3844 "EHLO bug.ucw.cz") by vger.kernel.org with ESMTP id ; Wed, 15 Nov 2000 16:33:54 -0500 Message-ID: <20001114222240.A1537@bug.ucw.cz> Date: Tue, 14 Nov 2000 22:22:40 +0100 From: Pavel Machek To: "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: rdtsc to mili secs? In-Reply-To: <3A078C65.B3C146EC@mira.net> <20001110154254.A33@bug.ucw.cz> <8uhps8$1tm$1@cesium.transmeta.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93i In-Reply-To: <8uhps8$1tm$1@cesium.transmeta.com>; from H. Peter Anvin on Fri, Nov 10, 2000 at 01:38:16PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > > Sensibly configured power saving/speed throttle systems do not change the > > > frequency at all. The duty cycle is changed and this controls the cpu > > > performance but the tsc is constant > > > > Do you have an example of notebook that does powersaving like that? > > I have 2 examples of notebooks with changing TSC speed... > > > > Intel PIIX-based systems will do duty-cycle throttling, for example. Don't think so. My toshiba is PIIX-based, AFAIC: root@bug:~# cat /proc/pci Bus 0, device 5, function 0: Bridge: Intel Corporation 82371AB PIIX4 ISA (rev 2). Bus 0, device 5, function 1: IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 1). Master Capable. Latency=64. I/O at 0x1000 [0x100f]. Bus 0, device 5, function 2: USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 1). IRQ 11. Master Capable. Latency=64. I/O at 0xffe0 [0xffff]. Bus 0, device 5, function 3: Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 2). Still, it is willing to run with RDTSC at 300MHz, 150MHz, and 40MHz. (The last one in _extreme_ cases when CPU fan fails -- running at 40MHz is better than cooking cpu). -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/