The APIC reduces processing overhead. The APIC bus on the pentium III is
pretty slow (I believe its a serial 4 wire bus or similar). On the
Athlon and Pentium IV it seems to be a lot faster.
In the case of a livelock the problem is probably the cost of handling
the IRQ and poking slowly at the chip. Latency is pretty immaterial here
compared with irq servicing overheads.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to email@example.com
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/