Are you booting an x86 or x86_64 install? Run: “uname -a” without quotes and post the results to us.
On Mon, Aug 2, 2021 at 6:12 PM <loushanguan2...@sina.com> wrote: > i have 2 memory slots > memtest86+ shows each has 2G, but total is 3G > after booting linux, top shows total is 3G > why 1 G is missing? Thanks! >