Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755516AbXLLA3K (ORCPT ); Tue, 11 Dec 2007 19:29:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751917AbXLLA25 (ORCPT ); Tue, 11 Dec 2007 19:28:57 -0500 Received: from ug-out-1314.google.com ([66.249.92.173]:4194 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751702AbXLLA24 (ORCPT ); Tue, 11 Dec 2007 19:28:56 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding:from; b=lG2C9eX0WtJ1+j1Ft/b9A46KayaXcwhrlQU7xbPHuYLqs9GJSmZoZeTOrsczcMssw+OVwV1WdoPKc5ajQlYrrQCAb4vyFyTCnYOSIrvUoEstyQ8DsyK+j+OHsUw1VYYfpKqBsoAXaWM3ndJ1k7M6otPG35eOxfXpF2B0knpaVvs= Message-ID: <475F2AF2.2060206@keyaccess.nl> Date: Wed, 12 Dec 2007 01:27:30 +0100 User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: Maxim Levitsky CC: Linux Kernel , dpreed@reed.com, Alan Cox , pavel@ucw.cz, andi@firstfloor.org, rol@as2917.net, Krzysztof Halasa , david@davidnewall.com, hpa@zytor.com, john@stoffel.org, linux-os@analogic.com Subject: Re: [RFT] Port 0x80 I/O speed References: <475F1DC6.5090403@keyaccess.nl> <200712120140.34697.maximlevitsky@gmail.com> <475F20EA.5050803@keyaccess.nl> <200712120214.21346.maximlevitsky@gmail.com> In-Reply-To: <200712120214.21346.maximlevitsky@gmail.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit From: Rene Herman Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 827 Lines: 24 On 12-12-07 01:14, Maxim Levitsky wrote: > CPU frequency locked to 2128.000 Mhz: > maxim@MAIN:~/tmp$ sudo ./port800 > cycles: out 1650, in 1065 > CPU frequency locked to: 1596.000 Mhz > maxim@MAIN:~/tmp$ sudo ./port800 > cycles: out 1730, in 1138 > A bit strange, isn't it? Well, yes. Don't know what that effect is. A bus-clock divided from the CPU clock comes to mind, but I believe that shouldn't happen to LPC. Anyways, we're looking for an upper bound and that's still nicely below 2 us on everything upto now, so I guess it doesn't matter all that much. Thanks! Rene. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/