Interrupt latency problems on MPC860

[Till Straumann]

Eric Norum wrote:

> Another way to get interrupt latencies down a little is to move the
> `tick()' processing to a high-priority task and have the timer interrupt
> handler send an event to this task.  The tradeoff is a little more time
> spent handling the timer/tick(), but now the tick() handling is
> interruptible.
>

Hmm -  the MVME23xx BSP re-enables IRQs before invoking the
decrementer (tick) handler. Hence, the hardware timer (one of the
OpenPIC's internal timers) should be able to nest into the tick handler,
right?

-- Till