From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: yifeng wu <y1feng.wu1234@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: Subject: [PATCH] arm/kernel/head.S: optimize __create_page_tables function
Date: Mon, 24 Feb 2020 12:03:03 +0000 [thread overview]
Message-ID: <20200224120303.GQ25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAKy1XqdBt=LNpk-7Rt2LXU3tky=fS9jHxD0DV5CKh4wYWxFVRQ@mail.gmail.com>
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?
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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prev parent reply other threads:[~2020-02-24 12:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAKy1Xqcnkfm7Dn9UvJ7Ufio-szQ75kbGS+GurBjuUFBydi21GA@mail.gmail.com>
2020-02-24 11:05 ` Subject: [PATCH] arm/kernel/head.S: optimize __create_page_tables function Russell King - ARM Linux admin
[not found] ` <CAKy1XqdBt=LNpk-7Rt2LXU3tky=fS9jHxD0DV5CKh4wYWxFVRQ@mail.gmail.com>
2020-02-24 12:03 ` Russell King - ARM Linux admin [this message]
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