Re: Incompatibility between 'Local APIC' and '8139too'

[Mikael Pettersson]

On Tue, 11 Feb 2003 00:47:12 +0100, Nicolas Baradakis wrote:
>Activating the option 'Local APIC support on uniprocessors' prevents
>the network device '8139too' from transmitting any packet.
>...
>The  workaround is  to boot  the kernel  with the  option  'noapic' or
>recompile it  without the  option 'Local APIC',  and then  the network
>device works perfectly.
...
>>From the debian package 'kernel-source-2.4.20_2.4.20-5_all.deb'

I strongly believe your problems are related to the I/O APIC,
not the local APIC:

- the local APIC has minimal impact on system-level IRQ handling,
  whereas the impact from the I/O APIC by definition is major

- the 'noapic' option disables the I/O APIC, NOT the local APIC
  (at least in all standard kernels, Debian may have broken this)

- disabling the local APIC kernel option also disables I/O
  APIC on uniprocessor support