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Date: Sun, 12 Jun 2005 09:27:02 -0600 (MDT)
From: Zwane Mwaikambo <zwane@fsmlabs.com>
To: Daniel Walker <dwalker@mvista.com>
cc: Ingo Molnar <mingo@elte.hu>, Esben Nielsen <simlo@phys.au.dk>,
       Linux Kernel <linux-kernel@vger.kernel.org>, sdietrich@mvista.com
Subject: Re: [PATCH] local_irq_disable removal
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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