dmesg在 6 个不同的系统（4 个服务器，为了比较也是 2 台笔记本电脑）上浏览 linux 内核输出时，我对大量的 BIOS/UEFI 保留 RAM 感到震惊
三个服务器系统都有这个输出
3 x server with 128GiB RAM show this
[ 0.000000] Memory: 5491432k/136314880k available (7668k kernel code, 2636180k absent, 2440136k reserved, 6052k data, 1876k init)
=> ~2.5GiB RAM "BIOS-reserverd"
1 x server with 512GiB RAM show this:
[ 5.892498] Memory: 527942676K/536409480K available (10252K kernel code, 1241K rwdata, 3320K rodata, 1592K init, 2272K bss, 8466804K reserved, 0K cma-reserved)
=> ~8.5GiB "lost to BIOS"
1 x latop with this …