On 2009-Jun-22 13:12:08 +0200, Wojciech Puchar <woj...@wojtek.tensor.gdynia.pl> 
wrote:
>i know all this, but i'm asking why processing single interrupt takes 
>40000 CPU cycles.

All I can suggest is that you browse the sources and see what the
rl(4) interrupt handler does.  If you want to dig further, hwpmc(4)
may give you further insights.

-- 
Peter Jeremy

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