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Interrupts

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Kernel Comparison: Linux (2.6.28) versus Windows (Vista SP1)

Interrupts

First Level Interrupt Handling

*First Level Interrupt Handling (FLIH)*	Linux	Windows
First-Level Interrupt Handler (#9, #10)	ISR	ISR
prioritised First-Level Interrupt Handler (-, #122)	N	Y
preemptive First-Level Interrupt Handler (-, #122)	N	Y
interrupt priority levels (IPL) (#13, #14)	1	32

Second Level Interrupt Handling

*Second Level Interrupt Handling (SLIH)*	Linux	Windows
Second-Level Interrupt Handler (#11, #12)	softIRQ/tasklet	DPC
interrupt classes - "softIRQ types" (#163, #164)	32 (4 used)	-
prioritised Second-Level Interrupt Handler (SLIH) (-, #122)	Y	Y
preemptive Second-Level Interrupt Handler (-, #122)	N	Y
interrupt priority levels (IPL) (#161, #162)	1	3

Multiprocessor Interrupt

*Interrupts (multiprocessor/multicore?)*	Linux	Windows
all CPUs - First-Level Interrupt Handler (FLIH) (#512, #512)	Y	Y
all CPUs - Second-Level Interrupt Handler (SLIH) (#512 #11, #512 #11)	Y	Y

Interrupt Scaling

*Interrupt (enhancement)*	Linux	Windows
Adaptive Interrupt Coalescing (#167, #168)	Y	Y

Hardware

*Hardware*	Linux	Windows
PIC	Y	Y
APIC (LAPIC & I/O APIC)	Y	Y
IPI	Y	Y

Interrupt Performance

*Interrupt (performance)*	Linux	Windows
interrupt latency (average) (#155, #156¹⁰)	11uS 5uS (custom)	36uS¹⁰
interrupt latency (maximum) (#191, #192¹⁰)	1000uS	45000uS¹⁰

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Johnathon Weare © Johnny Weare 2009

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