linux-kernel - Re: [PATCH v4 00/13] ARM LPAE Fixes

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Message-ID: <510BE9BC.9090701@ti.com>
Date:	Fri, 1 Feb 2013 11:13:48 -0500
From:	Cyril Chemparathy <cyril@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <sboyd@...eaurora.org>,
	Will Deacon <will.deacon@....com>,
	<paulmck@...ux.vnet.ibm.com>,
	Catalin Marinas <catalin.marinas@....com>,
	<marc.zyngier@....com>, <linus.walleij@...aro.org>
Subject: Re: [PATCH v4 00/13] ARM LPAE Fixes - Part 1

On 02/01/2013 10:14 AM, Russell King - ARM Linux wrote:
> On Fri, Feb 01, 2013 at 10:10:37AM -0500, Cyril Chemparathy wrote:
>> With this, I ran simple network and filesystem performance tests to
>> compare the code-patching vs. non-code-patching variants.  These tests
>> didn't yield any significant performance difference between the two on
>> an ARMv7 (Cortex-A8) platform.
>
> It's not network and fs activity that this kind of stuff is likely to
> show up in, but more to do with walking pages tables and the like -
> remember that page tables are stored using physical addresses, and any
> walks of them have to convert those physical addresses to virtual
> addresses and back again.
>
> So, things like page scanning for eviction (eg, page aging, page
> faults even those which just re-use a page from the page cache) have
> to use the v:p / p:v translation macros.
>

Thanks, Russell.  Any recommendations on how to best benchmark this?

Thanks
-- Cyril.
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