Hi, I'm wondering what means the VIR_DOMAIN_MEMORY_STAT_ACTUAL_BALLOON value . On a Windows Guest , rammap tool gives me following information : Driver Locked size 6.6 Giga This value is relevant with virsh dominfo of this Guest (equal to Max memory - Used memory): Max memory: 8704000 KiB Used memory: 2097152 KiB active_balloon (2048000.000000) Could you give me some light ? Thx . Regards, J.P. Ribeauville P: +33.(0).1.47.17.20.49 . Puteaux 3 Etage 5 Bureau 4 jpribeauville@axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.