Hi everybody, I am running uClinux on a custom board with the following configuration - 20070131 distro with 2.6.22.6 kernel - M5272 CPU clocked at 60MHz (not 66..) - Compiled with CodeSourcery 4.2-47 - Custom board has serial port, RJ45 ethernet
Essentially, our application only has one real-time requirement, everything else is more of a control nature where there is no real time constraints. The real-time event is served with an interrupt as - Interrupt line hooked up to ext 3 - priority 5 - request_irq called with SA_INTERRUPT We did some profiling on this interrupt and with a extremely stripped down driver for the interrupt we see the following numbers - 12.5 microsecond latency from interrupt line is pulled until service routine is getting called. If my arithmetic skills serve me right, that's 750 clock cycles. Questions: - Does this sound slow? Is this the latency you'd expect from a system above? - Does anyone else have any other interrupt performance stats for ColdFire that he/she wants to share? - Is there any way one can speed up the handling of an interrupt without re-inventing linux? Thanks in advance, Harry
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