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Subject: Re: [PATCH] local_irq_disable removal
From: Thomas Gleixner <tglx@linutronix.de>
Reply-To: tglx@linutronix.de
To: Daniel Walker <dwalker@mvista.com>
Cc: Ingo Molnar <mingo@elte.hu>, Esben Nielsen <simlo@phys.au.dk>,
       linux-kernel@vger.kernel.org, sdietrich@mvista.com
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Organization: linutronix
Date: Sun, 12 Jun 2005 01:44:45 +0200
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On Sat, 2005-06-11 at 13:51 -0700, Daniel Walker wrote:
> On Sat, 11 Jun 2005, Ingo Molnar 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?

No, because x86 is not the whole universe

tglx