丢失RAM问题

Question

我有一个32 and和64 and的Ryzen 5950 x。在这两种情况下，Ubuntu的报告都要少2-3GB。BIOS是最新的。

如果能收回那些2-3GB的内存，并使它们得到很好的利用，那就太好了。CPU没有集成的图形。

              total        used        free      shared  buff/cache   available
Mem:           62Gi         9Gi        44Gi       6.0Mi       7.8Gi        52Gi
Swap:            0B          0B          0B
[    0.062647] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.062649] PM: hibernation: Registered nosave memory: [mem 0x000a0000-0x000fffff]
[    0.062650] PM: hibernation: Registered nosave memory: [mem 0x09d1f000-0x09ffffff]
[    0.062651] PM: hibernation: Registered nosave memory: [mem 0x0a200000-0x0a20dfff]
[    0.062652] PM: hibernation: Registered nosave memory: [mem 0x0b000000-0x0b01ffff]
[    0.062653] PM: hibernation: Registered nosave memory: [mem 0x8f860000-0x8f860fff]
[    0.062654] PM: hibernation: Registered nosave memory: [mem 0x8f86f000-0x8f86ffff]
[    0.062655] PM: hibernation: Registered nosave memory: [mem 0x8f870000-0x8f870fff]
[    0.062656] PM: hibernation: Registered nosave memory: [mem 0x8f88f000-0x8f88ffff]
[    0.062657] PM: hibernation: Registered nosave memory: [mem 0xc3482000-0xc3482fff]
[    0.062658] PM: hibernation: Registered nosave memory: [mem 0xc70bc000-0xc70c1fff]
[    0.062659] PM: hibernation: Registered nosave memory: [mem 0xc8c52000-0xc8c52fff]
[    0.062660] PM: hibernation: Registered nosave memory: [mem 0xca615000-0xcaa13fff]
[    0.062661] PM: hibernation: Registered nosave memory: [mem 0xcaa14000-0xcabc4fff]
[    0.062661] PM: hibernation: Registered nosave memory: [mem 0xcabc5000-0xcaefafff]
[    0.062662] PM: hibernation: Registered nosave memory: [mem 0xcaefb000-0xcbbfefff]
[    0.062663] PM: hibernation: Registered nosave memory: [mem 0xcd000000-0xcfffffff]
[    0.062663] PM: hibernation: Registered nosave memory: [mem 0xd0000000-0xefffffff]
[    0.062664] PM: hibernation: Registered nosave memory: [mem 0xf0000000-0xf7ffffff]
[    0.062664] PM: hibernation: Registered nosave memory: [mem 0xf8000000-0xfd1fffff]
[    0.062665] PM: hibernation: Registered nosave memory: [mem 0xfd200000-0xfd2fffff]
[    0.062665] PM: hibernation: Registered nosave memory: [mem 0xfd300000-0xfd5fffff]
[    0.062666] PM: hibernation: Registered nosave memory: [mem 0xfd600000-0xfd7fffff]
[    0.062666] PM: hibernation: Registered nosave memory: [mem 0xfd800000-0xfe9fffff]
[    0.062667] PM: hibernation: Registered nosave memory: [mem 0xfea00000-0xfea0ffff]
[    0.062667] PM: hibernation: Registered nosave memory: [mem 0xfea10000-0xfeb7ffff]
[    0.062668] PM: hibernation: Registered nosave memory: [mem 0xfeb80000-0xfec01fff]
[    0.062668] PM: hibernation: Registered nosave memory: [mem 0xfec02000-0xfec0ffff]
[    0.062669] PM: hibernation: Registered nosave memory: [mem 0xfec10000-0xfec10fff]
[    0.062669] PM: hibernation: Registered nosave memory: [mem 0xfec11000-0xfec2ffff]
[    0.062670] PM: hibernation: Registered nosave memory: [mem 0xfec30000-0xfec30fff]
[    0.062670] PM: hibernation: Registered nosave memory: [mem 0xfec31000-0xfecfffff]
[    0.062670] PM: hibernation: Registered nosave memory: [mem 0xfed00000-0xfed00fff]
[    0.062671] PM: hibernation: Registered nosave memory: [mem 0xfed01000-0xfed3ffff]
[    0.062671] PM: hibernation: Registered nosave memory: [mem 0xfed40000-0xfed44fff]
[    0.062672] PM: hibernation: Registered nosave memory: [mem 0xfed45000-0xfed7ffff]
[    0.062672] PM: hibernation: Registered nosave memory: [mem 0xfed80000-0xfed8ffff]
[    0.062673] PM: hibernation: Registered nosave memory: [mem 0xfed90000-0xfedc1fff]
[    0.062673] PM: hibernation: Registered nosave memory: [mem 0xfedc2000-0xfedcffff]
[    0.062674] PM: hibernation: Registered nosave memory: [mem 0xfedd0000-0xfedd3fff]
[    0.062674] PM: hibernation: Registered nosave memory: [mem 0xfedd4000-0xfedd5fff]
[    0.062675] PM: hibernation: Registered nosave memory: [mem 0xfedd6000-0xfeffffff]
[    0.062675] PM: hibernation: Registered nosave memory: [mem 0xff000000-0xffffffff]

只是猜测一下，这是否是为冬眠/暂停预留的内存区域？如果是的话，我们能禁用它吗？

我使用5.11.0-22通用内核运行21.04。

谢谢!

Answer 1

大多数linux OSses计算内存的单位是吉字节，而不是千兆字节。我的16 so计算机只有15.4GiB的RAM (大约)。内存是可用的，但是GiB更大，所以显示给您的数量更小(而64 GiB实际上大约是62 GiB)。

Answer 2

我不能百分之百地肯定这一点，但是这个错误可能在你的计算中。您看，GiB不等于GB。GiB代表吉字节，而GB代表千兆字节。64 GB内存，实际上大约是59 GiB。

对于较小数量的ram，这并没有多大的区别，但在您的例子中是这样的。62 66GB实际上达到了66 to。我猜额外的2 GB来自交换文件/分区。