Re: [PATCH v4 00/13] ARM LPAE Fixes - Part 1

[Cyril Chemparathy]

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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