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Title: L2cache Description: A little utility to increase performance on your Sam460ex and Sam460cr board What it does: * on the 460ex CPU, coherency between memory and L2 cache can be managed via hardware snoop mechanism. Under some circumstances, the L2 controller may miss snoop-able write requestes and cause incoherency between L2 cache and main memory. To avoid this potential problem, the AOS4.1 kernel on Sam460 disable L2 cache write by default, slightly degrading performance. This utility enables L2 cache write and thus increases a little system performance. To be noted: IT MAY CAUSE SYSTEM INSTABILITY AND/OR DATA CORRUPTION if for some reason the OS perfom some operation which can cause incoherency between L2 cache and main memory, use it at your own risk ! Once L2 cache write is enabled, Ragemem will report around 35% speed increase in the L2 WRITE32/WRITE64 test, and some application may see improved performance too (for example 3-5% speed increase in MPlayer with some videos) The best use of this utility is to run it before any intensive task (for example playing a movie) then disable it, and not leaving it enabled all the time, to avoid any potential coherency problem. How to use: * if run from the shell without any argument, enables L2 cache write. It accept the following arguments: VERBOSE to show some informations OFF to disable L2 cache write and resume normal operations Notes: * the new setting doesn't survive a machine or OS reset. History: 06-Dic-2014 - Version 1.0 first release.
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