Hello, On Tue, Aug 03, 2021 at 07:14:32AM +0800, loushanguan2015@sina.com wrote: > Linux debian 4.9.0-13-686-pae #1 SMP Debian 4.9.228-1 (2020-07-05) i686 GNU/Linux So you are running 32-bit kernel. Will the hardware do 64-bit? What does $ cat /proc/cpuinfo say? You may be able to install an amd64 kernel and see all memory even though userland is still 32-bit. Thanks, Andy