Messages in this thread | | | Date | Fri, 1 Feb 2013 11:13:48 -0500 | From | Cyril Chemparathy <> | Subject | Re: [PATCH v4 00/13] ARM LPAE Fixes - Part 1 |
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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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