From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joe Jin Subject: Re: Why write CPER_NOTIFY_MCE to ERST when reboot Date: Sat, 01 Jun 2013 09:33:54 +0800 Message-ID: <51A94F82.40902@oracle.com> References: <51A85DCC.3000109@oracle.com> <51A8CA09.1060709@gmail.com> <3908561D78D1C84285E8C5FCA982C28F2DA71899@ORSMSX106.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from aserp1040.oracle.com ([141.146.126.69]:35706 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753129Ab3FABeH (ORCPT ); Fri, 31 May 2013 21:34:07 -0400 In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F2DA71899@ORSMSX106.amr.corp.intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Luck, Tony" Cc: Jiang Liu , "linux-acpi@vger.kernel.org" , david zhuang Tony and Gerry, thanks! Regards, Joe On 06/01/13 02:29, Luck, Tony wrote: > Gerry has this right - we want to preserve the error information, but we > don't trust our kernel enough to have it write to a regular disk (perhaps > it has no access to I/O because of the error - or worse, perhaps it might > write to the wrong place or the wrong disk). > > In theory data the information in the machine check banks is preserved > across a warm reset for the reboot - but in practice we may sometimes > need a power-cycle and full cold reset. Also I've heard that on some systems > the BIOS clears the banks before the OS can see them. > > -Tony > -- Oracle Joe Jin | Software Development Senior Manager | +8610.6106.5624 ORACLE | Linux and Virtualization No. 24 Zhongguancun Software Park, Haidian District | 100193 Beijing