* [QUESTION] The cost of local interrupt enable/disable
@ 2005-09-17 14:00 Tejun Heo
2005-09-17 14:32 ` Anton Blanchard
0 siblings, 1 reply; 2+ messages in thread
From: Tejun Heo @ 2005-09-17 14:00 UTC (permalink / raw)
To: lkml
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [QUESTION] The cost of local interrupt enable/disable
2005-09-17 14:00 [QUESTION] The cost of local interrupt enable/disable Tejun Heo
@ 2005-09-17 14:32 ` Anton Blanchard
0 siblings, 0 replies; 2+ messages in thread
From: Anton Blanchard @ 2005-09-17 14:32 UTC (permalink / raw)
To: Tejun Heo; +Cc: lkml
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2005-09-17 14:00 [QUESTION] The cost of local interrupt enable/disable Tejun Heo
2005-09-17 14:32 ` Anton Blanchard
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