15 Mar
2004
15 Mar
'04
2:26 p.m.
Mark Knecht wrote:
The priority, as I understand it, is driven by the
highest vector
number.
Actually, lower vector numbers have higher priorities. The priority
level is determined by the upper four bits of the vector number.
*APPARENTLY* interrupts with no vector (like the
system timer)
The system timer is redirected to interrupt 2. Don't ask why.
are either not handled by the APIC system, or are just
higher
priority than those with vectors.
Vector number 00 is reserved, so these entries are unused.
Unfortunately I know of no method to tune the system
interrupt
priorities other than move cards ...
The kernel must be configured to assign different vector numbers to
specific interrupts. The standard kernel cannot do this, but, as it
happens, I've just written a patch which adds this capability. See
<http://www.informatik.uni-halle.de/~ladischc/linux_interrupt_priorities.html>.
HTH
Clemens