Thomas Kenyon wrote: >The weird thing is, looking at the motherboard manual for my test >machine, The lower the Interrupt does not neccesarily mean the higher >the priority. Eg. 8 to 15 have a higher priority than 3 to 7. > >
Correct. IRQ 2 bridges to IRQ 8. Thus the priority order is: 0, 1, 2, 8, 9, 10, 11, 12, 13, 14, 15, 3, 4, 5, 6, 7 This is one reason why on modern Linux kernels where the ATA (IDE hard drive) driver is permitted to be very resource-greedy the serial ports on IRQs 3 and 4 can lose requisite attention for high-throughput serial devices (like Class 2.1 fax modems). And just think of those poor, poor printers on the LPT port, IRQ 7... The end-result is that the already slim pickings on IRQs gets reduced even further to a very narrow band for add-on PCI devices, usually just 9, 10, and 11 on many systems. This is one reason for APIC, although it's quite buggy in many kernels and motherboard BIOSes. Lee. _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
