linux-kernel - Re: Subject: [PATCH] arm/kernel/head.S: optimize __create_page

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Message-ID: <20200224120303.GQ25745@shell.armlinux.org.uk>
Date:   Mon, 24 Feb 2020 12:03:03 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     yifeng wu <y1feng.wu1234@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Subject: [PATCH] arm/kernel/head.S: optimize
 __create_page_tables function

Hi,

On Mon, Feb 24, 2020 at 07:54:07PM +0800, yifeng wu wrote:
> Thank you very much for your reply.
> I have tested on my machine. It takes about 0.5 seconds to copy the memory
> (16M size) with "str" instruction, and only 0.1 seconds with "stmia"

ITYM 16k.  You say "copy" but we're setting memory to zero.  I'm quite
surprised by that difference, which CPU was this measured on?

-- 
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