Measuring timer interrupt latency

Suresh Kumar SHUKLA
2009-04-13T07:07:45Z

Hi,

I want to profile the improvements in interrupt latency with and without RT
patches.

The approach I have in mind is that time gap between IRQ firing and IRQ
handler reading value of counter would be sufficient to reveal the interrupt
latency. These values can be analysed for min/max/avg.

Is there any test program which captures interrupt latency (for x86) ?
I checked realfeel but it is user mode program and am not sure of its
accuracy.

regards,
Suresh