Solution : https://service.sap.com/sap/support/notes/124199 (SAP Service marketplace login required)
Key words :
st06 / detail analysis menu / memory / previous hours / memory, contactthe sap sun competence center, additional key words performance sun, main storage bottleneck exists, memory page size, sun/solaris operating system, storage bottleneck exists, symptom performance problems, sr = scan rate, ultra sparc processors