Solution : https://service.sap.com/sap/support/notes/630876 (SAP Service marketplace login required)
Key words : 
param_startsession    param_put kerneldiagsize 800    param_checkall    param_commitsession, change takes effect, control    param_getvalue kerneldiagsize, kerneldiagsize reason, parameter  kerneldiagsize, kerneldiagsize parameter, knldiag file, cyclical basis, information important, support purposes
Related Notes : 
       
| 490958 | Initial parameterization of liveCache 7.4.2 and 7.4.3 |