[lkml]   [2003]   [Sep]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: PROBLEM: APIC on a Pentium Classic SMP, kernel 2.4.21-pre5 to 2.4.23-pre3
On Mon, 8 Sep 2003, Mikael Pettersson wrote:

> >IRQ problems with APIC enabled on a Neptune chipset, Pentium 90 SMP.
> >
> >Description
> >
> >Since kernel 2.4.21-pre2, IRQ problems are present on my Pentium 90 SMP, wi=
> >th
> >APIC enabled. It works well with 2.4.20 with APIC enabled, or with newer
> >kernels with "noapic" kernel option.
> There were a lot of I/O-APIC & MP table parsing changes in 2.4.21
> for clustered apic. Chances are something there broke on your
> ancient BIOS & mobo. I can't immediately see anything obviously
> broken in 2.4.21: you'll have to identify the first pre-patch where
> things broke and then test or revert it piece by piece.

The log shows the system is using a default MP configuration (i.e. no MP
table, only a suitable header). The recent changes definitely broke such
systems -- someone doing them seems to have not cared about the default
configurations. I've noticed the breakage recently and put it on my to-do
list, but unfortunately I have no time to code a fix now.

+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+ e-mail:, PGP key available +

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 13:48    [W:0.026 / U:1.056 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site