Re: [QUESTION] The cost of local interrupt enable/disable

[Anton Blanchard]

Hi,

>  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?

It varies on ppc64, but its in the order of 10s of cycles. 40-50 cycles
is probably a decent estimation.

Anton
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