TMS320C6657: QMSS based HW Queues have been disabled in OpenMP for Keystone I and II devices

Hi Sven,

We implemented a software based queue that had similar performance to the QMSS hardware queues.  This was required to port the OpenMP runtime to the AM572x family of devices which do not have QMSS.  To simplify code maintenance and to remove the dependency on qmss, we decided to phase out the usage of the QMSS hardware queues (and free up the qmss resources) in favor of the software queues.  We left the QMSS implementation in the software for now, but at some later date we may clean things up and remove the QMSS implementation.

Best Regards,

Eric Stotzer

Hi Eric,

thanks for your explanation.

I am not using QMSS in my project, is it save to remove some QMSS specific OpenMP settings from my config file, e.g. 

// QMSS initialized by application outside of OpenMP runtime
ompSettings.runtimeInitializesQmss = false;

// Set up OpenMP QMSS variables based on application usage of QMSS
OpenMP.qmssMemRegionIndex = -1;
OpenMP.qmssFirstDescIdxInLinkingRam = 0;

/***
* Call the application supplied QMSS init function 
* BEFORE __TI_omp_initialize_rtsc_mode()
*/
Startup.lastFxns.$add('&app_qmss_init');

Thanks and kind regards

Sven