linux-kernel - Re: [PATCH for mm] Remove iBCS support

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Message-ID: <4799467E.6020407@davidnewall.com>
Date:	Fri, 25 Jan 2008 12:46:30 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Adrian Bunk <bunk@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH for mm] Remove iBCS support

Andi Kleen wrote:
>> The performance benefit is trivial,
>>     
>
> That's actually not true when you're talking about potential cache misses.
> Cache misses are very expensive.
>   

They are when in a tight loop, but are trivial in this case.  I'll go
further and say that unless the system is constantly execing, there will
always be a cache miss, and that removing this code will not improve
that at all.
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