[rescue] Any Minneapolis area listers ?

Meelis Roos mroos at linux.ee
Thu Jan 11 10:39:58 CST 2007

> > The other part is that PCI isn't very good at more than 4 slots, and one
> > slot at least is usually taken up by motherboard components.
> And why's that? Because the PC architecture influences PCI IRQs, and PCI's
> four IRQs map 1:1 to PC IRQs. PCI is really just a light layer of 1990s
> gaffer tape over the misdesign of the 80s.

Hold on, it's 4 IRQ's per PCI bus. If you have 2 independent PCI busses 
in a server, it can be 8 IRQ's if IOAPIC is used (in PC architecture) 
and so on. With PCI-X and PCI-E Message Signalled Interrupts (MSI), each 
device can generate any number of different IRQ's and they don't have to 
be shared (no point in sharing them).

Meelis Roos (mroos at linux.ee)

More information about the rescue mailing list