[rescue] Any Minneapolis area listers ?
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)
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