Re: [PATCH] local_irq_disable removal

Zwane Mwaikambo
2005-06-12T15:23:55Z

On Sat, 11 Jun 2005, Daniel Walker wrote:

> Interesting .. So "cli" takes 7 cycles , "sti" takes 7 cycles. The current
> method does "lea" which takes 1 cycle, and "or" which takes 1 cycle. I'm
> not sure if there is any function call overhead .. So the soft replacment
> of cli/sti is 70% faster on a per instruction level .. So it's at least
> not any slower .. Does everyone agree on that?

Well you also have to take into account the memory access, so it's not
always that straightforward.

Zwane