Well, in legacy mode (a.k.a. normal), each ATA port (a.k.a. channel
a.k.a. bus) gets their own interrupt, which is never shared with another
device.
In native mode (a.k.a. enhanced), two ATA ports share a single PCI
interrupt. Further, this interrupt may be shared with any number of
other PCI devices.
So, high interrupt count is necessarily a worry because you're probably
seeing a coalescing of multiple interrupt counts into one big one.
Jeff
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