Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161208AbVIPRm7 (ORCPT ); Fri, 16 Sep 2005 13:42:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161210AbVIPRm7 (ORCPT ); Fri, 16 Sep 2005 13:42:59 -0400 Received: from mail-red.bigfish.com ([216.148.222.61]:45770 "EHLO mail28-red-R.bigfish.com") by vger.kernel.org with ESMTP id S1161208AbVIPRm6 (ORCPT ); Fri, 16 Sep 2005 13:42:58 -0400 X-BigFish: V Message-ID: <432B0421.3060807@am.sony.com> Date: Fri, 16 Sep 2005 10:42:57 -0700 From: Tim Bird User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Tim Schmielau CC: jesper.juhl@gmail.com, "Randy.Dunlap" , linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: early printk timings way off References: <9a87484905091515495f435db7@mail.gmail.com> <432AFB01.3050809@am.sony.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1191 Lines: 34 Tim Schmielau wrote: > On Fri, 16 Sep 2005, Tim Schmielau wrote: > The "Detected 1400.279 MHz processor." line just happens to be written > _during_ time_init, when use_tsc is already set, but cycles_2_ns is not > yet initialized. That's exactly what I surmised as well. Our e-mails must have crossed each other. :-) > So I think everything is well-understood. It's just a matter of whether > it's worth fixing. Exactly. My own testing has focused on bootup time measurement. Historically, the time spent before time_init() has been relatively small and so I haven't (often) focused on trying to measure it accurately. Although, I have done this on occasion to get complete results. Andrew's suggestion of a replaceable clock function would satisfy me. What do other's think? -- Tim ============================= Tim Bird Architecture Group Chair, CE Linux Forum Senior Staff Engineer, Sony Electronics ============================= - 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/