Re: APIC error on CPUx

[Vladimir Dvorak <dvorakv@vdsoft.org>]

Brown, Len wrote:

> 
>  
>
>>The problem goes away with noapic or acpi=off, but of course that also 
>>means you don't have IRQs > 15.
>>    
>>
>
>"acpi=off" is a superset of "noapic" here, presumably because the
>board doesn't have MPS  tables that describe the IOAPIC when ACPI is
>off.
>
>"noapic" is a perfectly reasonable thing to use if you don't
>have a lot of interrupt sources and there is no more sharing
>in PIC mode than IOAPIC mode.
>
>The advantage of using IOAPIC mode is that the system has more interrupt
>pins
>availalble and this allows sharing to be avoided.  It also allows
>the system to target the interrupts to any processor when you
>have more than one.
>
>cheers,
>-Len
>
>  
>
My experience yesterday:

Server with  'noapic' cannot boot, kernel reports something like "Lost
interrupt: hde"  ( it was said by my college, server is not in my
physical control ) . With 'acpi=off' it boots, but errors appear again.

Brief datasheet about the board is here:
http://www.abclinuxu.cz/images/hosting/sr1200.pdf

Vladimir
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/