From: David Newall <davidn@davidnewall.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Adrian Bunk <bunk@kernel.org>, Ingo Molnar <mingo@elte.hu>,
akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH for mm] Remove iBCS support
Date: Fri, 25 Jan 2008 12:46:30 +1030 [thread overview]
Message-ID: <4799467E.6020407@davidnewall.com> (raw)
In-Reply-To: <20080124203724.GA14852@one.firstfloor.org>
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.
next prev parent reply other threads:[~2008-01-25 2:16 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-19 4:59 [PATCH for mm] Remove iBCS support Andi Kleen
2008-01-20 2:27 ` David Newall
2008-01-20 3:11 ` Andi Kleen
2008-01-20 4:46 ` David Newall
2008-01-20 5:18 ` Andi Kleen
2008-01-20 5:33 ` David Newall
2008-01-20 5:55 ` Andi Kleen
2008-01-20 6:23 ` David Newall
2008-01-20 7:29 ` Andi Kleen
2008-01-21 1:37 ` David Newall
2008-01-22 10:24 ` Karl Kiniger
2008-01-22 15:06 ` David Newall
2008-01-22 15:52 ` Adrian Bunk
2008-01-23 8:48 ` Andi Kleen
2008-01-23 14:12 ` Karl Kiniger
2008-01-23 14:24 ` Andi Kleen
2008-01-24 17:06 ` David Newall
2008-01-22 11:12 ` Ingo Molnar
2008-01-22 12:42 ` Karl Kiniger
2008-01-22 15:13 ` David Newall
2008-01-22 15:49 ` Ingo Molnar
2008-01-24 17:01 ` David Newall
2008-01-22 16:01 ` Adrian Bunk
2008-01-24 17:04 ` David Newall
2008-01-24 17:24 ` Adrian Bunk
2008-01-24 17:55 ` David Newall
2008-01-24 18:14 ` Adrian Bunk
2008-01-25 2:14 ` David Newall
2008-01-25 5:12 ` Valdis.Kletnieks
2008-01-25 16:40 ` Alan Cox
2008-01-24 19:51 ` Pavel Machek
2008-01-25 2:17 ` David Newall
2008-01-24 20:37 ` Andi Kleen
2008-01-25 2:16 ` David Newall [this message]
2008-01-22 16:50 ` Alan Cox
2008-01-24 17:08 ` David Newall
2008-01-22 13:20 ` Giulio
2008-01-20 13:06 ` Alan Cox
2008-01-20 13:43 ` David Newall
2008-01-20 13:51 ` Alan Cox
2008-01-25 12:17 ` Ingo Molnar
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