From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 21 May 2001 04:55:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 21 May 2001 04:55:38 -0400 Received: from WARSL401PIP5.highway.telekom.at ([195.3.96.112]:13874 "HELO email03.aon.at") by vger.kernel.org with SMTP id ; Mon, 21 May 2001 04:55:27 -0400 Message-ID: <3B053183.188C47BD@violin.dyndns.org> Date: Fri, 18 May 2001 16:28:19 +0200 From: Hermann Himmelbauer Reply-To: dusty@strike.wu-wien.ac.at X-Mailer: Mozilla 4.76 [en] (X11; U; Linux 2.4.1 i686) X-Accept-Language: en MIME-Version: 1.0 To: Andy Arvai CC: linux-kernel@vger.kernel.org Subject: Re: APIC errors on 2.4.4 In-Reply-To: <200105180650.XAA04197@astra.scripps.edu> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andy Arvai wrote: > > Hi, > > I'm having IO-APIC errors with 2.4.4. I spent some time searching the > web to understand more about this problem and I'm still not sure if > it is a hardware problem on the motherboard or a problem with the > kernel. I will try the noapic boot option, but are there any > patches that might fix this? Here are some of the errors I was > getting: > > May 15 22:47:43 rad kernel: APIC error on CPU0: 02(01) > May 15 22:48:00 rad kernel: APIC error on CPU0: 01(02) This is a hardware error. I also have a buggy motherboard (586DX) and experience the same problems. Looke at /proc/interrupts, there you can see how many errors are detected. The problem is that double errors are not detected - these can lead to system crashes or block network/isdn cards. If there are only a few APIC errors, it is very unlikely that a double error occurs, if there are very many, the probability is high. It seems that there are quite a lot of motherboards that have a buggy APIC. There is some patch by Alan Cox in the 2.4.4-ac series that does something about this problem but I do not know what exactly. The only thing you can do is boot with the "noapic" option, and disable IO-Interrupts on the second CPU (I assume you have a SMP system?). This will reduce the amount of errors but there is also a performance decrease. Regards, Hermann -- ,_, (O,O) "There is more to life than increasing its speed." ( ) -- Gandhi -"-"--------------------------------------------------------------