Re: lenovo R60 SMP/APIC_IO woes

[Petr Janda <elekktretterr@xxxxxxxxxxxxxx>]

Matthew Dillon wrote:
>     No, its probably a summary interrupt from the IOAPIC.  Because the BIOS
>     is stupid, hardware chipsets are often able to route *ALL* of the masked
>     IOAPIC interrupts to a single PIC interrupt.  It's usually IRQ 7 or
>     IRQ 15.  Since the method to disable this routing is not usually
>     documented, we have no way of turning it off short of hoping that the
>     BIOS knows how to do it when we use the IOAPIC.  Some IOAPICs 
>     automatically route this special interrupt if their pins are masked.
>     Unfortunately, pin masking is a normal part of our interrupt handling
>     code (linux does something nutty to try to avoid pin masking).
>
>     The only real solution is for us to not use IRQ 7 at all and just
>     mask it out on the PIC.
>
>
>   
Hi Matt,
Reading this makes me wonder, what does FreeBSD do about this issue? 
They do not have APIC_IO option (as far as i know they have just option 
SMP) and it seems to be relatively trouble free in regards to 
IOAPIC/LAPIC: On DragonFly it seems to be an issue more often.

Petr