Messages in this thread | | | Date | Sun, 12 Jun 2005 08:46:55 -0700 (PDT) | From | Daniel Walker <> | Subject | Re: [PATCH] local_irq_disable removal |
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I was just trying to get an idea of the possible slow down if any, and for x86 I'm convinced that it's not a slowdown..
Daniel
On Sun, 12 Jun 2005, Zwane Mwaikambo wrote:
> 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 > >
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