[lkml]   [2001]   [May]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: APIC errors on 2.4.4
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

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

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


(O,O) "There is more to life than increasing its speed."
( ) -- Gandhi
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:53    [W:0.037 / U:0.732 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site