[QUESTION] The cost of local interrupt enable/disable

[Tejun Heo]

 Hello, guys.

 I'm curious about the cost of local_irq_enable/disable()'s on various 
architectures.  I found a freebsd discussion thread by googling which 
says that each takes 3 cycles on i386 (very cheap), but for Pentium4, 
people are talking in the order of several hundreds cycles.  Are these 
correct?  How about other architectures?

 TIA.

--
tejun
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