Hi,
I launched an AWS instance `t2.medium` (use CentOS 7 image "ami-7abd0209",
product code: https://aws.amazon.com/marketplace/pp/B00O7WM7QW), which is
supposed to have 4GB Memory in total, but turn out it is only "3.5GB".
```
$ free -h
total used free shared buff/cache
available
Mem: 3.5G 441M 1.4G 16M 1.6G
2.7G
Swap: 0B 0B 0B
```
It does not happen to AWS Ubuntu 16.04.
```
$ free -h
total used free shared buff/cache
available
Mem: 3.9G 49M 3.3G 5.5M 518M
3.7G
Swap: 0B 0B 0B
```
This seems to happen to all AWS CentOS image, regardless which instance
type it is.
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