Messages in this thread |  | | Date | Fri, 18 May 2001 16:28:19 +0200 | From | Hermann Himmelbauer <> | Subject | Re: APIC errors on 2.4.4 |
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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
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