From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752257AbeCTREV (ORCPT ); Tue, 20 Mar 2018 13:04:21 -0400 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:57115 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752211AbeCTREO (ORCPT ); Tue, 20 Mar 2018 13:04:14 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R911e4;CH=green;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04452;MF=qixuan.wu@linux.alibaba.com;NM=1;PH=DS;RN=4;SR=0;TI=SMTPD_---0SznUFD6_1521565448; Message-ID: <5AB13ECE.2090005@linux.alibaba.com> Date: Wed, 21 Mar 2018 01:03:10 +0800 From: Qixuan Wu User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: John Stultz , Thomas Gleixner , Stephen Boyd CC: linux-kernel@vger.kernel.org Subject: About dmesg time and uptime Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi All, I have a doubt in kernel 4.9 about dmesg time and uptime. Would you please to help to clarify whether it's bug or not. Below is our log. The dmesg time second is large than uptime second. [25049978.919097] bond0.700: port 9(veth4e77160) entered forwarding state [25049978.926455] bond0.700: port 9(veth4e77160) entered forwarding state [chenggang.qcg@e80g10383 ~]$ cat /proc/uptime 25023128.55 1416627078.34 I found dmesg second is just directly get from tsc (x86 64 platform). While the uptime is get by a complicated computation. In my another board running 4.9, uptime is very large than dmesg second (about 8000 second). Thanks & Regards Qixuan Wu